I cant understand what does 4000 mAh mean and what's the meaning of 3 volt?
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The symbol mAh means milliampere hour. This is a unit of electric charge, and it's the most common way to express the capacity of small batteries. Bigger batteries are labeled in ampere hours.
The term voltage in a battery refers to the difference in electric potential between the positive and negative terminals of a battery.
Batteries range in voltage from a few hundreds of a volt to many hundreds of volts, depending on both the size of the battery and the materials from which it is made.
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