Video door bell are widely used in every family. Real time video recording the visitors.Two way audio talk function .This Video door bell with 3.7V Lithium Rechargeable battery. 190mA standard working current, the standby power consumption is about 20~30mA.
Picture of Cell
 
1)PCM:
This battery pack applied special designed protection circuit: 
Over charge, Over discharge, Short circuit and over current protection.Prevent battery from fire and explosion.
2)Protection IC:
The protection IC with real time detection function: over charge ,such as over discharge ,over current and short circuit protection. It ensured battery security and stability.
4) NTC 
It will detect the temperature of battery, and active the protection system.
 
Cell model:DF-453759  1000mAh / 3.7V     Battery Cycle Life Characteristics:                             Discharge Rate Characteristics