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One lasts longer than the otherShort answer: a 2850 mAh will last quite a bit longer than an 1850 mAh.

Long answer: mAh stads for "Milliamp hours" Many flashlight bulbs use around 500 mAh, which means that in one hour, they will use up 500 milliamps of electricity. A standard double A battery ("AA") is 1.5 volts. Many flashlight bulbs require 2 batteries to operate... So lets make an example bulb. It's a 3 V 500 mAh bulb. With two 2850 mAh AA batteries, that bulb will shine roughly 11.4 hours before needing a charge (2850 mAh times 2 batteries is 5700 mAh total. Divide that by the bulbs' 500 mAh and you get 11.4 hours) With a couple of 1850 mAh, the same bulb would only shine for 7.4 hours. As a battery gets close to dying the bulb will dim. Picture the battery like your lungs. Take a full breath, the battery is charged. Breath out at a constant rate, and when you get close to the end of your lung capacity you will start to push less and less air until you are just *barely* blowing any air out. That's kindof what happens with a low battery (EE's will probably blast me on that one, but that's the best way to describe it to someone who doesn't feel like reading a term paper on electrons)

Hope that helps!

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Actually, if you put two 1.5V 2850mAh batteries in SERIES, you will get a 3V and 2850mAh battery. The voltage doubles but the current capacity does not. If you were to put the two batteries in PARALLEL, the voltage would remain 1.5V but the current capacity would double to 5700mAh. The consequence is that the bulb will shine half the time that was calculated in the original answer. The rest of the demonstration is fine.

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Some corrections the original answer:

Firstly a typical rechargeable AA cell is rated at 1.2v not 1.5v. Non-rechargeable AA cells are typically 1.5v.

Secondly mAh is a measure of the battery's capacity; bulbs do not have a capacity, so you do not rate a bulb in mAh you rate it in mA. So a conventional filament bulb as implied above might draw 500 mA from the cells when you apply 2.4 volts (in series).

Some correction are in order assume 500mah means that battery can provide 500ma for 1 hour that is true. That the way should be read.. At 1 hour do not expect nothing more. And adding two battery in parallel is a very bad idea there can be circulating current between batteries adding in series the current remain 500mah but the power has increase two fold because now there is 2.4v available.

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9y ago
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9y ago

A 900 mAh battery will last longer than a 550 mAh battery they both must be the same voltage output though to be interchangeable. mAh stands for milli amp hour. The higher the mah number the longer the battery will last

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14y ago

mAh is a measure of how much energy a battery can store - so a 2800mAh battery will last nearly twice as long as a 1500mAh battery, take longer to charge and probably be more expensive.

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