Its power plug is a coaxial barrel, outer diameter 3.5 mm, inner diameter 1.1 mm (approximate), insertion depth 8 mm. Logitech mm50 has an inlet for an external power supply. (Topic: Logitech mm50 & Pure Fi anywhere batteries) This battery is discussed in some detail, with pictures, on iLounge. As simply one cell comprises its battery, it can be re-celled fairly easily. Its battery protection board connects to mainboard through three wires: black (battery negative), red (battery positive), and white (NTC thermistor between black and white, if I recall correctly, but check yours to be sure). ![]() Its battery cell is soldered to a protection circuitboard, and surrounded by insulator skin (heat shrink tube). Like EKWF said (#comment229709), a Logitech mm50 battery contains a single 18650 cell.
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