Electronics Engineering
Electrical Engineering
The Difference Between
Batteries

What is the difference between 1850 mAh and 2850 mAh in rechargeable batteries?

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2014-05-05 16:16:17

"One_lasts_longer_than_the_other" id=

"One_lasts_longer_than_the_other">One lasts longer than the

other

Short 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!

--------------------------------

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.

--------------------------------

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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