mAh is a unit of charge.
For example, if you draw 2 mA for 5 hours, you have used 2 mA · 5 h = 10 mAh.
You can approximate how long a battery will last by dividing its total charge (in mAh) by load current (in mA).
Say you have a 1800 mAh battery, and you connect it to a 20 mA load:
1800 mA⋅h20 mA=1800mA⋅h20mA=90 h
For example, if you draw 2 mA for 5 hours, you have used 2 mA · 5 h = 10 mAh.
You can approximate how long a battery will last by dividing its total charge (in mAh) by load current (in mA).
Say you have a 1800 mAh battery, and you connect it to a 20 mA load:
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