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# milliampere hour (mAh)

A milliampere hour (mAh) is 1000th of an ampere hour ( Ah ). Both measures are commonly used to describe the energy charge that a battery will hold and how long a device will run before the battery needs recharging.

For example, an IBM Thinkpad 365 with an Nickel-Metal Hydride 9.6 voltage battery that is stated to provide a charge of 2800 mAh offers from 2.5 to 5 hours of battery use without recharge.

This was last updated in March 2011

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how much would a 1000 mAH LiPo rechargeable battery last?

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This does not at all explain what the a mAh really indicates. To determine how long a device will last given a battery that has a certain mAh rating you would need to know how much current the device draws. If you have a the current draw of a device in mA you can simply take the mAh number and divide by the mA draw to get how many hours the device can run on that battery. mAh is an indication of stored charge.
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How long is a piece of string?
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what is the equivalent hour capacity of 1800 mAh because my battery.... is 1800 mAh
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Ha ha what a useless bit of info.
Basically everyone the higher the 'mah' the longer your battery will hold charge. Your volts or (V) on the battery must remain the same or you'll kill your device. All the best. Danny
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This does not explain what an amp hour actually is. What a useless definition.
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Its confusing to me because the measurement of an amp already includes a time factor. Coulombs/second is an amp.
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Hello
I recently bought an adapter which has two outputs ! Every single one is 1000 mah ! My problem is that I have a powerbank which has 5200 mah capacity and it needs an 1.0A adapter and it doesn't charge from mine one ! What should I do ?
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In battery operated computers which call for a 4400mAh battery, what affect would a battery with 5200mAh capacity have on the computer?  would it damage it in any way?
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