The lithium-ion battery protection board provides charge and discharge protection for series-connected lithium-ion battery packs. When fully charged, it ensures that the voltage difference between individual cells is less than a set value (typically ±20mV), achieving equal charging of all cells in the battery pack and effectively improving the charging performance under series charging. Simultaneously, it detects overvoltage, undervoltage, overcurrent, short circuit, and overtemperature conditions of each individual cell in the battery pack, protecting and extending battery life. Undervoltage protection prevents damage to each cell from over-discharge during discharge.
Lithium-ion batteries consist of a battery and a protection board. Three wires only appear on the protection board; the battery itself always has only two wires. There are two types of lithium-ion batteries; the one clearly showing 3.7V is a non-aluminum iron phosphate battery and can be directly replaced.
Replacement is simple (pay attention to the positive and negative terminals).
1. Remove the original lithium-ion battery packaging, then use a soldering iron to separate the protection board from the battery.
2: Similarly, remove the protection board from your new lithium-ion battery and connect the battery to the old protection board.
Connect P+ and P- to the output. Connect B+ to the positive terminal of the battery cell, and B- to the negative terminal. If multiple cells are connected in series, connect the negative terminal of B1 and the positive terminal of B2 together, and so on, with the negative terminal of the last cell connected to Bn-. Solder the wires first, then connect the batteries last, making sure not to connect them incorrectly. If there is no output after completion, remember to use a charger to charge and activate the battery at the charging interface from P+ and P-.
