1. Cell matching standard
1.1 After receiving the battery cell, leave its voltage empty and put it aside for a week before proceeding with the matching selection.
1.2 Cell standard: empty voltage 2.7±0.1v, 2.8±0.1v; internal resistance ≤1m Ω; capacity ≥100Ah

1.3 Matching standard: voltage difference≤0.1V; internal resistance≤0.5mΩ; capacity difference≤1Ah

2. Treatment method of unbalanced cells

2.1 If there is an unbalance during use, it needs to be balanced. First, test the voltage of the single string to find out the unbalanced string and see if the voltage of the single string is too high or the voltage of the single string is too low. Then proceed to the next step.


2.2  If the voltage of a single string is too high, discharge the entire battery pack to protective voltage. Then, test the voltage of a single string, and use an adjustable load to discharge the battery voltage. Just make it similar with the other 15 strings. Or use a resistor to discharge. (Note: If you use an adjustable load, you need to pay attention to its voltage state to prevent the voltage from being over-discharged, which will lead to scrap; if you use a resistor to discharge, the resistor has its own over-discharge protection. But if you use a resistor for too long and so many times, you can use a single battery to discharge to test whether it is still over-discharged protective.) (taking 16S for example)


2.3 If the voltage of a single string is low, and the remaining voltages are high, the entire battery pack needs to be discharged, and the adjustable power supply is used to charge the low string of batteries. The charging current can be larger than the discharging current. (Note: When using an adjustable power supply, set the voltage to be 3.65V. The current is variable. Note that the voltage needs to be tested at any time. When the voltage is similar with other voltages, please stop discharging.)


2.4 If the entire battery pack is discharged to the protective voltage without protection, it means that the BMS has been damaged and needs to be replaced.

4S protection voltage: 8-10V;
8S protection voltage: 16-20V;
12S protection voltage: 24-30V;
16S The protection voltage: 32-40V.
The minimum over-discharge protective voltage of a single cell is 2.0V; (If the voltage is as low as these voltages, please stop using it in time to prevent damage to the cell by putting the cell to 0V without any protection)