This is quite a neat device. It's a universal charger suitable for NiMh/NiCd cells and standard cylindrical lithium cells with an upper charge voltage of 4.2V (not suitable for LiFePO4 cells). It's USB powered and uses magnetic contacts to make a solid connection onto the cell being charged. The internal circuitry detects the voltage and polarity and then charges accordingly. Note that I said the LEDs were red/blue, but they are actually red/green. Red for charging and green for complete. Not sure what the component marked S8KP (or SBKP) is. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm