Use this to recover your battery if it has not been used or charged over a long duration of time. you only need to use this charger one time and then a normal charger can be used. The 0V charger will only recover a battery with voltage from 22V to 27V (cut off voltage). You should measure the voltage of your pack with a multimeter (we have these for sale) before purchasing the 0V charger to ensure you are within this range.
NOTE: Free shipping only applies when backed in conjunction with a bike as they will ship in the same box, otherwise shipping costs will be billed depending on country of shipment.