DIY Battery Case Single Cell Protection Detection BMS for 18V Battery BL1830 BL1820 BL1815 BL1860B 400

Battery protection board with single cell protection detection How to DIY your new battery Noticed : built-in High quatlity INR18650 30A Discharge Battery cells . Colour:black Material:plastic Package Contents: 1 x Battery pack set(Some accessories are slightly different which will not affect the use) Only the above package content other products are not included. Note: Light 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.