No-Original, New,No Battery Cell !!!!!! This product is componentwithout battery core. It is used to repair and assemble batteries pack, only for people who are familiar with battery performance and have practical experience in battery assembly. it can fill 3 pieces of 18650 li-ion batteries, but this is only a shell, there is no battery inside. For 10.8V 12V Li-ion Battery dcb125 dcb127 Preparation before assembly: 1. If a new core is used, please note: (1). Please use 18650 power lithium battery andsmall internal resistance, same model and same parameters, Do not use ordinary lithium battery for energy storage (2). please test the voltage of a single 18650 battery,and charge the single battery so thatthe voltage of each 18650 battery is the same. 2. If the old battery is repaired, please test the voltage at both ends of each cell. If the voltage is different, please charge each cell to the same voltage value. Very important: that the voltage of each 18650 cell is the same before