## How to convert mAh to Watt-hours (Wh)?

### milliamp-hours to watt-hours calculation

**E(in Wh) = Q(in mAh) × V(V) / 1000**

So that you can calculate watt-hours as

**watt-hours(Wh) = milliamp-hours(mAh) × volts(v) / 1000**

**Let’s take an example:**

How do I convert battery wattage from mAh to Wh.If you have qa 500mAh battery rated at 8V,

the power is

300mAh * 500mAh * 8V / 1000 = 4Wh

### what is mAh?

when you look at a battery there is two rating mention note it one is voltage rating and the other is the mAh rating.

voltage rating is nothing but the maximum voltage that is the that is going to be supplied by the battery and the mAh rating of the milliamp-hour rating is nothing but the storage capacity of the battery.

mAh which is milliamp hour is the product of current express milliamp hour multiplied by time expressing hours.

mAh = current(mA)*time(h)

When manufactures says that this is turnovers 3000mAh battery then what is mean by that its battery can supply turnovers to the load for 1 hour when the load is drawing 3000milliampiers from it.

3000mAh/3000mA=1hour

and similarly when the load is drawing 100 milliamperes from the battery then the battery can supply follower to its for 30 hours and when the load is drawing 200 mA from the battery then the battery can supply 12 hours to it for 15 hours. 300mAh/200mA=15h in that way you can calculate the battery backup time when you have the load current mention for you.

3000mA/3000mA=1h

3000mAh/100mA=30h

3000mAh/200mA=15h

when you know how much current the load is going to draw from the battery then you can easily calculate the battery backup time using the mAh rating.

mAh(Rating)/Load Current(mA)=Backup Hours

So more the mAh rating more of the storage capacity of the battery.

Watt Hour is defined as the power of the battery that could provide the specified energy for one hour and after that battery drains off. In case if the battery provides more energy then the discharging time decreases.

Let’s take one example for clear understanding if a battery is rated at 100WH that means the battery should produce 100watts (i.e 12v*8.33A ) for one hour but if the load draws 16amps(192 watts) instead then it could give out its energy only for half an hour.so if the load current is doubled then its discharge time reduces by two and it goes on.