When you buy a new car, there’s the expectation that after some time the vehicle will become less reliable and need replacement tires, spark plugs, or perhaps a new rotary girder. For many owners, this is an expectation around the 100,000 mile mark.

Just like any automobile, you should expect to hit the 100,000 milestone with your laptop as well. At this time you might need additional memory installed, a PC health check, or a laptop battery replacement.

For laptop batteries, you can expect to lose significant performance after 1 – 2 years. Laptop model, frequency of use, and the environment a Dell Vostro 1310 battery is stored will also contribute to longevity.

How much battery power can you expect to to lose? That depends on the model of your laptop and who you ask.

Hewlett-Packard estimates an 80% loss in original capacity “after 300 cycles or about one year of use.” Apple’s response is similar. They project an 80% loss in battery capacity after 300 cycles. Dell, on the other hand, estimates their customers will experience notable declines in battery life after 18 – 24 months.

One battery cycle is used every time a battery is charged or discharged. Technically speaking, it is defined as the number of cycles a battery can perform before its nominal capacity falls below 80% of its initial rated capacity.

If you own an Apple notebook, you can determine your exact battery cycle count here.

If you’ve had the same old laptop and battery for four or more years, it’s definitely time for an upgrade. If it’s been as long as six or more years without replacement, your battery has probably been useless for years now.

However, when users attempt to make a payment by using credit card without logging in to PayPal account, occasionally PayPal will reject, or doesn’t accept the credit card users desired to use with the following error message:

The credit card you entered cannot be used for this payment. Please enter a different credit card number.

The issue is little tricky because the rejection may happen with credit card which previously accepted and worked properly, then suddenly stopped working, or worse, payment will not be accepted even if user changes or switches to any other credit cards.

There are many possible causes that can result in such credit card rejected error, and PayPal doesn’t give specific explanation on how to resolve the problem and make the payment goes through processing again, with the same or different credit card. Here’s some explanations and possible resolutions that suggested by users on Internet.

Credit Card Is Linked or Associated with a PayPal Account

Many believes the credit card is not accepted by PayPal when using it not signing into PayPal account is that the credit card is already been used in a PayPal account. If you’re using a credit card that’s linked or assigned to a PayPal account, try login to PayPal during payment process. You can change the source of fund to make the payment after logged in to use credit card instead of PayPal balance.

Credit Card Is Previously Used in PayPal Account or Assigned in Closed PayPal Account

PayPal remembers a credit card details even when it’s already been removed from the account. The information also been remembered even if PayPal account which linked to the credit card is closed and deleted. In this case, try another credit card, or assigned the credit card to a PayPal account, and pay with account logged in.

PayPal Limit on Non-Member Credit Card Usage

According to PayPal source, there is a limit based on the number of times, the amount of the transactions, the type of merchandise being sold that a credit card can be used within the system without having to verify ownership by opening an account. The restriction is for security and fraud protection reasons. There is no workaround to this limitation, but you should be able to use another credit card. If there is problem, try using another email address. Else, register an PayPal account.

Credit Card or Email Address Raises Flag in the Transaction

Closely link to reasons above, where some part of the transaction raises flag on the server that stop the payment. Two possible flags are on credit card or email address. Try changing either credit card or e-mail address or both when attempting to pay again.

Cookies Problem

Try using another web browser and/or delete cookies and attempt to pay with PayPal gateway using credit card again.

Credit Card Is Not Confirmed in Account

Contrary to some of the reasons above, if the credit card has been linked to an account, but not yet confirmed, try to complete all credit card information such as Card Verification Number or Security Code, and confirm the card by entering the PayPal code shown on the credit card statement on special refundable charge by PayPal.

In all case, the problem won’t arise if you add the credit card to PayPal account, and use it as funding source to pay the transaction through PayPal account.

Dell Latitude D630 battery (http://www.brand-new-battery.com/dell-latitude-d630.htm) review: 

Dell Latitude D620 laptop battery Dimension Description:

Net Weight : 460g
Voltage: 11.1V
Capacity: 4400mAh/7200mAh
Type: Li-ion
Number of cells: 6 or 9 
UL certificated cells inside!
100%OEM compatible, guaranteed to meet or exceed OEM specifications!
Dell Latitude D630 laptop battery Warranty 
1 year warranty

Microsoft has issued a statement about this issue on their MSDN blog:

“To the very best of the collective ecosystem knowledge, Windows 7 is correctly warning HP Pavilion ZD7000 batteries that are in fact failing and Windows 7 is neither incorrectly reporting on HP Compaq Business Notebook NX6325  battery status nor in any way whatsoever causing IBM ThinkPad T60 battery to reach this state. In every case we have been able to identify the TOSHIBA PA3465U-1BRS  battery being reported on was in fact in need of recommended replacement. …every single indication we have regarding the reports we’ve seen are simply Windows 7 reporting the state of the Dell INSPIRON 1420  battery using this new feature and we’re simply seeing Dell INSPIRON 1720 batteries that are not performing above the designated threshold. … We are as certain as we can be that we have addressed the root cause and concerns of this report, but we will continue to monitor the situation.”

Well, Microsoft is saying everything is working.  But, the users are still reporting issues?  How is this going to wind up?  Is it really the fault of the PC manufacturers?Are we dealing with a bad Dell LATITUDE D800  battery manufacturer?  What is next for this?

Having defragmentation at regular intervals makes your data arranged in a more systematic order which makes the hard drive work less for accessing any of the data. The more quicker in the move of hard drive, lesser work load on the battery which helps your battery to last longer.

Try to reduce the background processes which are not required. Also monitor the resource as how much usage it is accessing with the help of Windows Task Manager (in Windows). Make sure that if you are not using internet, it is safe to stop the non required programs which are running in the taskbar like the antivirus and or the firewall. Remove not necessary programs which are running during start-ups by launching the System Configuration Utility from Run – Msconfig – Tab Startup. Unclick the programs which are not required to launch and restart the computer once.

Programs such as defragmentation or a virus scan should be scheduled for a time being when you are close to a power outlet.

USB External devices are the biggest observers of battery power. Try to unplug external devices such as external mouse, PC cards, Wi-Fi, external speakers, Bluetooth, Pen drives, portable hdd and iPod.

Try to keep the CD-DVD Rom tray vaccant when not required. Also don’t leave any CD/DVDs inside the drives. A spinning disk inside the drive may extract the power from your battery.

Avoid using the plugin DVD rom / external drives which generally runs on batteries. You can transfer the content to the hard drive or you can also run virtual drives like Pismo File Mount, Alchohol 120%, Daemon tool or even Microsoft’s Virtual CD ROM Control Panel.

The newly laucnhed screen types of laptop is another medium of power sink. Reduce the brightness to the appropriate level at which you can tolerate the visual with the help of Function key toggles or using the Display Settings in the Control Panel.

Try to mute the speakers volume and avoid using multimedia software for better battery life. Also you can avoid sound schemes which are installed which may reduce your battery life.

For best battery life, switch off the screensaver.

Newly programmed operating system such as Windows Vista come along with generic features such as ‘Aero Glass’ which are resource users. You can make it disable and can move to ‘Classic’ appearance which consumes less power. In Windows Vista, click on Desktop and then Preferences and then View Colour and then Appearance and then Classic Appearance and Windows Basic graphical interface. In Windows XP, right click and select properties and then Display Properties and then Theme and select Windows Classic.

Whereas operating system such as Linux and Macintosh, they are already better optimized for providing longer and powerful battery life.

You can check power management from the ‘Power Options’ available in the Control Panel. Both Windows XP and Windows Vista operating system consists of advanced power management features which helps you to turn off components like the monitor or the hard drive for a specific time being. It is also depended on the selected ‘Power Schemes’ for windows XP operating system in the same window. For example in windows XP operating system, you can go to ‘Max Battery’ below Power Schemes in order to select for maximum dell inspiron 1520 battery optimization.

Similar features available below ‘Mobile PC’ in Control Panel of windows Vista operating system.

Sometimes we make our laptop in the Stand by mode or sleep mode; but in such cases the computer turns off the hard drive and the monitor display but memory will be active which does make the CPU to slow down. This reduces the battery life. In such cases, hibernation mode should be applied as the computer saves the present state and turn off itself down completely which saves power.

A major reason for reducing battery life is to work on several programs which exherts pressure on the battery and thus leads power wastage. Make use of graphics oriented applications to a minimum level. If you are working on an application such as spreadsheet which generally consumes less power than playing your favourite game. You can also increase the life of the battery by just opening required one or two programs simultaneously.

Systematic RAM usage lower’s the load on Virtual memory which actually works for the hard drive. If you observe, more RAM usage leads to more power which also increases entire savings by reducing access to power observer hard drive.

A laptop with more dust and dirt which generally blocks air vents generate more heat which actually reduces the life of the battery. You can try to clean the air vents time to time which will help you to keep operating temperatures low. Try to open space near the vents for air to circulate freely. Also try keeping the area near the laptop clean for avoiding more of dust.

Undue heat may reduce battery life slowly but surely. Also avoid laptop exposing under direct sunlight or inside a closed car.

More problems for the laptop user’s who have older Ni-MH batteries than for Li-Ion batteries which are available on recent modern laptops. Memory effect are related to the loss of battery power when they are continuously recharged after being partially discharged. This are prevented by discharging the battery completely and then again completely recharge it. Li-Ion batteries have no problems regarding partial discharges and recharge and complete discharge is not recommended for them.

It may sound a bit strange but newly arrived drivers and software are basically designed for being more efficient and less usage of battery power.

Make sure that the adapter you are using for charging the laptop battery is a genuine one or it has correct specifications. A cross quality or model adapter may cause a kind of overload which can also damaging the laptop and the battery.

If you have made a decision regarding no usage of laptop on batteries for some time, then make sure that the charge of the battery should be 40 % and then you can remove the batteries and store it in a cool place and dry place.

A normal lithium ion battery has an average life of nearly 2 to 3 years. With the help of some tricks and caution, its damage can be delayed.

Hotest Laptop Battery Lists:

Dell XPS M1210 Battery

Dell XPS M1330 Battery

Dell XPS M1530 Battery

Dell XPS M1730 Battery

Dell inspiron 1525 Battery

Dell INSPIRON 6400 battery

Dell Inspiron 9400 Battery

HP PAVILION DV9000 battery

A new dell xps m1530 battery comes in a part charged condition and should be discharged before use (refer to your computer manual for charging instruction). Upon initial use (or after a prolonged storage period) the battery may require two or four charge/discharge cycles before achieving maximum capacity.

When charging the HP Pavilion dv9000 battery for the first time your computer may indicate that charging is complete after just 10 – 15 minutes. This is a normal phenomenon for rechargeable batteries. Simply remove the battery from the computer and repeat the charging procedure.

If the Dell Inspiron 6400 battery will not be in use for a month or longer, it is recommended that it be removed from the device and stored in a cool, dry place.

It is normal for a Sony VGP-BPS8 battery to become warm during charging and discharging.

A charged Dell XPS M1730 Battery will eventually lose its charge if unused. It may therefore be necessary to recharge the battery after a storage period.

A Li-Ion Laptop battery voltage rating is 10.8V or 14.4V; actually they are the same as 11.1V or 14.8V respectively.

How long will a New Battery Power a Laptop?

This is difficult to determine. Actual battery run-time depends upon the power demands made by the equipment. In the case of notebook computers, the use of the monitor, the hard drive and other peripherals result in an additional drain upon the battery, and effectively reduce the battery’s runtime. The total run-time of the battery is also heavily dependent on the design of the equipment.

Generally our new high capacity battery will last as long (and most usually 20-50% longer) as your old battery did when it was new.

What is the Life Span of a New Battery?

The life of a rechargeable Lithium ion Rechargeable battery under normal conditions is generally about 500 charge/discharge cycles. This means one and a half to three years of battery life for the average user. As the rechargeable battery begins to die, the user will notice a decline in the running time of the battery. When a battery that originally operated the notebook for three hours is only supplying the user with an hour’s worth of use, it’s time for a new one.

How are batteries rated? (What are Volts and Amps)

There are two rating on every battery: volts and Amp-hours (AH or mAH). The voltage of a new battery should match the voltage of it original unless the batteries are different chemistries (NI-MH and Li-Ion batteries have different voltage ratings, even if they are for the same laptop). Most of our batteries have a higher amp-hour rating than the original battery found in the device. This is indicative of a longer run-time (higher capacity) and will not cause any incompatibilities.

How can I maximize battery performance?

• Break in new battery – new batteries come in a half charged condition and must be fully discharged and then fully charged before use. It recommended that you fully charge and discharge your new battery two or four times to allow it to reach its maximum capacity.
• Keep your battery clean – it’s a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between your battery and laptop.
• Exercise your battery – Do not leave your battery dormant for long periods of time. We recommend using the Dell XPS M1210 battery at least once every two to three weeks. if a battery has not been used for a long period of time, perform the new battery break in procedure described above.
• Condition your battery – Complete discharge it and then recharge it completely. This will help the battery maintain maximum life. When running on AC power unit only leave the battery in the battery bay when it needs to be charged.
• Battery storage – If you don’t plan on using the battery for a month or more, we recommend storing it in a clean, dry, cool place at room temperature but away from heat and metal objects. Li-Ion will self discharge during storage (but have no memory effect); remember to break them in before use.

For laptop users

To get maximum performance from your sony vgp-bps9 battery, fully optimize the notebook’s power management features prior to use. Power management is a tradeoff: better power conservation in exchange for lesser computer performance. The power management system conserves battery power by setting the processor to run at a slower speed, dimming the screen, spinning down the hard drive when it’s not in use and causing the machine to go into sleep mode when inactive. Your notebook user’s guide will provide information relating to specific power management features.

    Thanks for your trust and choice to our laptop battery. Please refer to our manual before using. It can help you to know how to use correctly and take good care of their health. As we know, Battery is a kind of expendable with a Limited life. but it can evidently as long as we keep them properly and charge and discharge suitability.

Revise your laptop battery to arrive at the best perfomance

There is a Micro-CPU inside the Battery. It can calculate the power when charging or discharging. It’s necessary to update again and again to ensure the time and percent will be displayed correctly on the screen.

1. Please click right key at the blank of Screen, and Choose the “attribute” – “Screen-ProtectionItem” – “power” – “The project for power use” – “Portable”.  Then mark all items as “Never” and cancel alarm when less-power or no power.

2. Use only battery until there is no power to supply the laptop and shut down.

3. Connect laptop with adapter and charge it to 100%, it should be charged or discharged completely to make that be powerful when you use it for the fore three-times. We kindly advise you to charge the new battery more than 14 hours ( Including the battery stored for a long-time ).

You have to revise your battery after discharge them and charge them to 100%, then, no matter how about the power, you can take off the power at anytime. Meanwhile, you can charge them and discharge them completely to calculate the power. It will never affect the fact Capacity of battery.

Tip: All the files will be lost when the battery discharge completely and Laptop will be shutted down forcedly.

How to store the battery?

The battery will be damaged when you leave it for a long-time. We kindly advise you that take the battery out from the laptop if you do not plan to use that frequently, you can charge the battery at 60%-80% and store it in a dry, cool and clean room. It is necessary for you to charge them in time to avoid the damage and the loss of battery power. It will be more helpful for you to ensure the battery work better to use it once a month.

The security of Battery

Do not make the battery be short-cycle, it will be affected seriously.

Do not Hit, Throw or Abuse, it will cause the corrosive appears on the battery.

Do not store the battery in a hot ,wet or rainy room.

Do not throw the battery to the fire. keep it far away from fire away from fire. It will be exploded by this.

Do not decompose, repair or Juggle the battery, it would burn, and The alkalescency liquor will cause Fire or hurt to human .Even Death.

Do not perforate the battey with a sharp weapon.

FAQ

1. Question: How long can a new battery to supply the laptop?

Answer: It is very hard to ensure the running time of new battery. It is decided by the power of equipment, the size of screen, hard disk or other accessory, they need the power to supply, total running time of  battery will be decided by the design of equipment as well.

2. Question: Why the power will be reduced even no use?

Answer: Because of the humidity and non-insulated environment. All the batteries will be discharged naturally. It depends on the quality and newness grade. It is nomal to reduce 1% power in 3-4 days.

3. Question: Should l take out the battery when l use the adapter?

Answer: Generally speaking , the battery will be charged when the power lower than 95%. so just as you like. But we advise that do not take out the battery. It is helpful to keep the date better. if necessary for you to take out, please do remember to charge  them in time and keep them properly as we mentioned.

4. Question: Will it shorten the life if not use them completely?

Answer: The life of battey calculate accord to the cycle time. Li-ion battery can last for 300-400 times. Of course, it’s no necessary worry about that it will be calculated when you charge it for a short time. Actually, they will be calculated when charge and discharge fully as one time cycle .

5. Question: Why does my power display as 0% although I charge it for more than  20 hours and laptop will be shut down without adapter?

Answer: Check the Connection beteeen Battery and Laptop! It can not charge the battey but only check the data. so, you can take the battery out and try it for serial times. Plug the battey into laptop and it’s available when you hear “Du”.  Please pay more attention to IBM Series and try more to debar this kind of problem.

6. Question: Why does the laptop discharge while working without adapter. but shut down without adapter at once charge it to 100%?

Answer: You should look into the temperature of working environment, it will automatically shut down to protect the battery while working in a high-temperature room. You can take out the battery and keep it in a cold dry place for a while then. Re-try toturn on the laptop. Also another possibility exist: Maybe something wrong during the laptop-charging. then, please check that is it working with original battery. 

7. Question: What’s the matter with my Dell laptop when I Plug the battery. but it shows:Cannot find the battery ?

Answer: This just proves that it is not compatible with your laptop. Please ask your supplier to change another one.

8. Question: It can work without battery. but will shut down when connect with battery?

Answer: It seems the battery is damaged. You should change another new one. But it appears rarely.

9. Question: Why does my laptop always be shut down automatically before previse to dormancy for many times? Furthermore, why can it last for few minutes only?

Answer: Pleaser refer to the “Revise your battery to work in a best way”, Please contact with your sopplier to change another new battery if can not solve it all the same!

10. Question: Why the power can only charge to 30%? How to be 100%?

Answer: Pleaser refer to the “Revise your battery to work in a best way” Please contact with your sopplier to change another new battery if can not solve it all the same!

11. Question: Why does my laptop show 100% power after 10 minutes charging at the first time?

Answer:Pleaser refer to the “Revise your battery to work in the best way”. Please contact with your supplier to change another new battery if can not solve it all the same!

12. Question: Why I Can use it for 3 hours at the first time, but can not charge in the second time. Is there anything wrong with the battery?

Answer: Pleaser refer to the “Revise your battery to work in a best way”. Please contact with your supplier to change another new battery if can not solve it all the same!

Publish By：www.brand-new-battery.com

Batteries in portable consumer devices (laptops and notebooks, camcorders, digital camera, etc.) are principally made using either Nickel Cadmium (Ni-Cd), Nickel Metal Hydride (Ni-MH) or Lithium Ion (Li-ion) technologies. Each type of rechargeable battery technology has its own unique characteristics:Ni-Cd and Ni-MH: the main difference between the two is the fact that Ni-MH batteries (the newer of the two technologies) offer higher energy densities than NiCads. In other words, pound for pound, Ni-MH delivers approximately 100% more capacity than its Ni-Cd counterpart. What this translates into is increased run-time from the battery with no additional bulk to weigh down your portable device. Ni-MH also offers another major advantage: NiCad batteries tend to suffer from what is called the “Memory Effect”. Ni-MH batteries are less prone to develop this dreaded affliction and thus require less maintenance and care. Ni-MH batteries are also more environmentally friendly than their Ni-Cd counterparts, since they do not contain heavy metals (which present serious landfill problems).Li-ion has quickly become the emerging standard for portable power in consumer devices. Li-ion batteries produce the same energy as Ni-MH batteries but weigh approximately 35% less. This is crucial in applications such as camcorders or notebook computers, where the battery makes up a significant portion of the device’s weight. Another reason Li-ion batteries have become so popular is that they do not suffer from the memory effect AT ALL. They are also better for the environment because they don’t contain toxic materials such as Cadmium or Mercury.

2.How long do batteries last?

The life of a rechargeable battery operating under normal conditions is
generally between 500 to 800 charge-discharge cycles. This translates into one
and a half to three years of battery life for the average user. As your
rechargeable battery begins to die, you will notice a decline in the running
time of the battery. When your two hour battery is only supplying you with an
hour’s worth of use, it’s time for a new one.

3.What is the run time of notebook battery?

Excel notebook batteries have two main ratings on them: Volts and Milliamperes. Because size and weight of notebook batteries is limited when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamperes. One thousand Milliamperes equals 1 Ampere. When buying a battery, select batteries with the most Milliamperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together. For example:

14.4 Volts, 4000mAh (Note: 4000mAh is equal to 4.0 Amperes).

14.4 x 4.0 = 57.60 Watt-Hours

Watt Hours signifies the energy needed to power one watt for one hour. This Excel notebook battery can power 57.60 watts for one hour. If your notebook runs at 20.50 watts, as an example, this notebook battery could power your notebook for 2.8 hours.

4.How to Choosing the right AC/DC adapter?

Before you buy any AC/DC laptop adapter, please make sure the AC/DC laptop adapter will give you the correct voltage and suitable current output.

To find out the voltage & current, turn your laptop over and look for a label, sticker or writing which shows the voltage and current, it should look something like the examples below. The voltage figure will have a “V” after the number i.e 19V and the current will have a “A” or “mA”. i.e 3.15A, 950mA. You can also find these shown in a similar fashion on the original AC adapter if you have it. In the examples below the voltage & current has been marked with a red ring.

AC/DC Adapter Calculator
Enter the voltage and current then click calculate for the wattage=Voltage X Current

Adapter Wattage Required = V X A

Such as Voltage =15V Current
=3A Adapter Wattage=15v*3A=45W
PLEASE NOTE: If the wattage requirement for your laptop is lower than the 60W or 90W output of the adapter, it will not damage your laptop, your laptop will only take the amount of power it requires. I.E. If your laptop needs 45W, then either the 60W or 90W will work OK. If your laptop needs 80W then you will need the 90W one as the 75W one will not be powerful enough.
Only if you were to plug a 19V adapter into a 15V laptop would you run the risk of damage. If in doubt please email us on our contacts page.

5.How to choose and identify a right laptop battery?

When purchasing a battery for your laptop computer, the first thing a consumer should look for is the reputation of the product at mind. If the product is made by the manufacturer of your laptop (i.e. Sony, Compaq, Dell, etc), you can usually be sure it is a quality product. However, many manufactures do not actually manufacturer, instead they are the brander of the product. for example, if you open up a genuine Sony laptop battery, you may find that the power cells inside are actually made by Toshiba, Panasonic, or a similar big name company. Sony in this case has just made the plastic case of the battery. This goes to show that the brand of the battery you are buying does not necessarily mean that the quality is superior. Many third party brands use the exact same power cells as original manufacturers. Using a third party manufacturer is often a good way to go when buying a battery, as there are usually many extra benefits. for instance, most third party batteries are much lower in price than original manufacturers? Secondly, they usually offer a superior warranty, as they realize that in order to win the consumer’s confidence; they must stand behind their product. A one year warranty is a must. Don? buy any battery with a warranty less than one year. Batteries have been known to die early, and a three month warranty could leave you high and dry.

The next main thing a consumer should look for is the type of battery. Batteries can be made using several chemicals. for laptops, there are four main types. They are Ni-Cad, Ni-MH, Li-ion, and Li-Poly. There is no major manufacturer that still makes Ni-Cad laptop batteries, as they are a very old and primitive type of power. Ni-MH is newer and more advanced, but is not as good as its Li-ion and Li-Poly counterparts. If we compare the last three types (Ni-MH, Li-ion, Li-Poly), we find that Ni-MH batteries weigh more than the other two, but produce less current than the other two. Li-ion and Li-Poly are the most advanced types of batteries on the market, and you should try to get one of these two types if possible. Most laptops that come with one type of battery can not use any other type of battery, meaning that if your laptop came with a Ni-Cad, it must be replaced by another Ni-Cad. The same goes for the other types. Please note that in some cases, this does not apply. Some laptops that come with a Ni-MH battery can be replaced with a stronger Li-ion one.

Lastly you must look at the power rating of the item you?e buying. As technology advances, so do power ratings. The battery you bought last year may be twice as strong this year, and might even be the same physical size. Batteries have two main ratings on them: Volts and Amperes. Because laptop batteries do not carry a very large amount of power when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamperes. One thousand Milliamperes equals 1 Ampere. When buying a battery, always go for the battery with the most Milliamperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together. We will now show you an example of finding the Watt-Hours for our example battery.

Our example battery is 14.4 Volts, 3600mAh
(remember that 3600mAh is equal to 3.6 Amperes).

14.4 x 3.6 = 51.84

This battery has 51.84 Watt-Hours. The term Watt Hour signifies the energy needed to power one watt for one hour. Thus this battery can power 51.84 watts for one hour. Suppose your laptop runs at 25.92 watts (this may be unlikely, but let? use this just for simplicity). This battery could power your laptop for 2 hours. People usually associate the word ?atts?with light bulbs, and yes, this battery could power a 40 watt light bulb for about an hour and 18 minutes, a 60 watt light bulb for about 52 minutes, or a 100 watt light bulb for 31 minutes; it? the same idea.

The reason we have shown you watt-hours is because oftentimes the volts and Amperes vary. for example our laptop that uses a Li-ion 14.4 Volt, 3600mAh battery may use a NI-MH battery that is 9.6 Volts, 4000mAh. Now let? do the math and find out which battery is stronger.

Li-ion: 14.4 Volts x 3.6 Amperes = 51.84 Watt Hours
Ni-MH: 9.6 Volts x 4 Amperes = 38.4 Watt Hours
The Li-ion is stronger.