YX-720S 마사지건 수리 (배터리 리밸런싱)

This is something I wanted to include at the end of the video, but since it's already long and I'm afraid it'll be too much to say, I'll just explain it instead. As you can see in the video, the battery built into this massage gun is a 2S1P lithium-ion battery. A white wire is placed in the center to allow for differential charging and monitoring of each cell. The battery connector on the circuit board also has a 3-pin terminal, with the center terminal connected to the charging circuit. Despite this, the cell balance is so poor that I doubt the BMS is functioning properly. Or, it could have been damaged by using a fast charger. For the time being, I'll charge it slowly using a PC USB port and monitor its condition. Filming equipment: Galaxy Note 9 Editing software: Kdenlive #Lucky7 #SelfRepair