also provide 500 milliamps of current for 2 hours, or 200 mA for 5 hours, etc. You might not really precisely estimate this in vaping terms. However, generally, a 3000 mAh battery on a box mod ...
It can output a continuous 3.6V with a full charge of 4.2 V. Also ... a flat-top is a flat battery surface and may seem too short if your vape mod requires a button-top battery.