Learn the basics of Electrical Engineering.

Battery Capacity Formula and What you Should Know about it

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:
  1. Laptop and mobile phones batteries are rated in mAh instead of Ah. Since their capacity is very small.
  2. A 2000 mAH battery can deliver 2000 mA for 1 hour.
  3. The same battery delivers 1000 mA for 2 hours.
  4. 500 mA for 4 hours.
  5. 4000 mA for half hour.
  6. 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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