Lithium battery packs are usually combined in series and parallel with a single 3.6V / 3.7V multi-cell rechargeable lithium battery, and then equipped with a charging and discharging circuit protection board to protect the battery pack and electrical equipment.

The further step is to use the SMBUS bus for intelligent communication between the battery pack and the device.

Common battery combinations are

1) Single section: mainly used for mobile phones, MP3 / MP4, game consoles, etc .;

2) Two strings: mainly used for digital cameras, small capacity cameras, walkie-talkies, etc .;

3) Three / four string: mainly used for portable laptops, large-capacity DV machines, etc .;

4) More than four strings: mainly used for power tools, mobile medical equipment, field detection instruments, etc .;

For the mass production of lithium battery packs for portable mobile devices, strict matching must be performed in terms of capacity and internal resistance to ensure that the lithium batteries in the same group have the same capacity and internal resistance.

Basically the same, otherwise it will cause great safety risks and greatly shorten the service life of lithium battery packs and equipment.