Plastic Case (no battery cell) and Charging Protection Circuit Board For 48-11-2830 M28 Li-ion Battery This product is component without battery core. , No Battery Cell ! 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 14 pieces of 18650 power li-ion batteries; But this is only a shell, there is no battery inside. Preparation before assembly: 1. If a core is used, please note: (1). Please use 18650 power lithium battery and small 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 that the 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 welding PCB. Note:Due to different production batches, the screen printing/circuit/appearance on the protection board are different, but the functions are the same and do not affect the use. Colour:Black Material:PCB+Plastic+Metal Package Contents: 1 * Li-ion Battery Plastic Case 1 * Li-ion Battery Protection Board(The color of the protection board is random and cannot be specified) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.