Lithium cell phone mainly by the plastic case cover lithium battery protection circuit board (PCB) and recoverable fuse polyswitch Some manufacturers also configure the NTC identification resistor or vibration motor or charging circuit and other components.


phone lithium battery


The functions of each part are as follows:

Lithium batteries cells: provide rechargeable and dischargeable source.
Protect the circuit board: to prevent the battery from over-discharge, over-charge and short-circuit.
Recoverable Fuse (PTC): The positive thermistor functions as a thermal protector while protecting the board from double failure.

Recoverable Fuse (NTC): Negative thermistor, sensing battery internal temperature plays a low temperature protection.
Identification resistance: identify the original battery, non-original battery can not be used.