1. Plastic case (without battery cell) and printed circuit board are suitable for 20V 60V flexible voltage lithium battery DCB612. 2. If you new core please 18650 lithium battery with small internal resistance, and parameters, do not ordinary lithium battery for energy , please test the voltage of each and charge each battery so the voltage of each is the . 3. If the old battery has been repaired, please test the voltage at both ends of each battery. If the voltage is different, please charge each battery to the voltage value. 4. This product is a part without a battery cell. It is used for repairing and assembling battery packs. It is only for those who are familiar with battery performance and have practical experience in battery assembly. 5. It can hold 10 18650 lithium- batteries with LED battery status indicator, but it is only a housing with no batteries inside. The circuit board comes with overheat protection, overvoltage protection, undervoltage protection, overcurrent protection, overcharge protection, all the features and quality are designed to replace the original battery, satisfaction guaranteed. Material: Metal + Plastic colour: As shown Package Contents: 1 set x Battery Packs Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.