Comment by zevv

Question I have: is it just a bunch of cells wired up, or is there a BMS (battery management system) in there doing the things you need to do to make a battery safe and make it last: cell balancing is essential to make sure the pack will survive more then a few charges and rides before it will kill itself. Also I would not like a battery pack that does not switch itself off when voltages or currents get too high, which is a great way to start a thermal runaway. Not a safety issue, but important to make sure the battery is not abused is to prevent deep discharge voltage or charging the battery at too low temperature.