The capacity of a battery is a measure of charge it can deliver to an external circuit. The basic formula for capacity is:

Capacity = Current Drain * Time

In simple terms:

*Capacity = ampere-hour*
Where A = Amount of current in amps

h = Time in hours for which charge is delivered

Remember,

**.***it is*~~ ampere per hour~~ ampere-hour
Important points to remember:

- Laptop and mobile phones batteries are rated in mAh instead of Ah. Since their capacity is very small.
- A 2000 mAH battery can deliver 2000 mA for 1 hour.
- The same battery delivers 1000 mA for 2 hours.
- 500 mA for 4 hours.
- 4000 mA for half hour.
- From above 5 points, one can understand it is not the mobile phone battery whose amperes count in terms of capacity, but it is the mobile's charge consumption that decides run hours.

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