Laptop Computer Batteries For Toshiba

• For tecra r950 -- TOSHIBA Tecra R950-10V Replacement Battery 5200mAh, 58Wh 11.1V Black Li-ion
• Genuine TOSHIBA P755-S5381 Battery For laptop 4400mAh, 10.8V, Black , Li-ion

Why are batteries in phones measured in mAH, and why are computer batteries in watts, whats the difference between the two and how do batteries work?

Charge capacity in mAh = milliamps x hours. This is the amount of current that can be supplied over a time. It’s independent of the voltage. Also 1000 mAh = 1 Ah

Watts is a unit of power. It is independent of charge capacity. It’s the ability to supply energy a a certain rate.

Watt-hours, Wh = watts x hours. This is how much power can be supplied over a time.

To get from Ah to Wh you have to multiply by the voltage.

Somewhere else on Quora there is a nice entry using tanks of water to illustrate voltage, current, capacity and energy.

Voltage = height of the tank

Current = size of outlet pipe

Power = rate of water running out of the outlet pipe = ie. current times voltage.

Energy = volume of the tank times its height ie. how long the above can continue.

Charge capacity = volume of the tank.