Comment by amluto

> Motorola pagers (a widely used type) seem to typically take a 3.5V 500mAh battery, which if I'm doing my conversions correctly (mAh * V * 3.6) works out to about 23 MJ.

Batteries should really quote energy, not charge, for this reason. The voltage is not a constant.

But something’s wrong with your math. Even assuming a constant 3.5V, that’s 1.75Wh, and 1Wh is 3600J, so that’s 6300J.

23MJ would drive a car a respectable distance :)