Hi, i really hope someone can help me with this... what type of battery that is suitable for an electric vehicle(slow walking speed,electric wheel barow)? is it a deep cycle marine? I have a problem on how to choose the correct battery. i have choose a motor which can produce a max mechanical power output of 400Watts. http://www.boschmotorsandcontrols.c...2/kennlinie.htm if you look at the characteristic curve, my working torque would be around 2-3Nm, the corresponding current required is about 100A. The problem is due to the fact that the vehicle need to be as compact as possible, i can only choose one 12V battery 100Ah battery. i initially try to pick the right motor by using the assumption that, stall torque>torque require.This i know is not efficient+the rpm is slower near stall torque. Right now the motor that ive choosen got the right working torque(2-3Nm) and rpm, and is >50% efficient but the power source could not supply more than (2-3Nm), what happens if the required torque is more than 2-3Nm??