The YDL 403858 is a 850mAh 3.7V rechargeable lithium polymer (LiPo) battery measuring 4 x 38 x 60 mm including the protection board and weighing about 18.1 g. It arrives with a built-in PCM protection circuit, 50 mm 26 AWG lead wires and a JST PH2.0 (PHR-2) 2-pin connector already fitted, so it can drop straight into your device. Typical applications IoT sensors, smart home devices & handheld electronics: Smart home sensor Door lock GPS tracker Electric toothbrush Beauty device Custom options The lead length and connector type can be changed to match your build. The capacity is fixed by the cell size, so if you need a different capacity tell us the space you have available and we will point you to the right model. Safety notes The red lead is positive (+) and the black lead is negative (-). Do not reverse the polarity, charge above 4.2 V, puncture the cell or expose it to open flame. Always charge with a constant-current / constant-voltage LiPo charger.
