LowkeeRider
100 mW
- Joined
- Jul 17, 2012
- Messages
- 49
I have headway 38140 12A LiFePO4 battery pack, has about 3000km on it and could charged to 56.6v. Few months ago, I unwrapped the pack but made a mistake of damaged the BMS. There was no problem making the 25km to and from work without a BMS. Start voltage 56.3 end 52.7 volt. At the end half the cells has 3.31v and the other half has 3.28v. Not sure how many watts used but the cells looks good, I guess.
So I bought a new 16s 45a BMS from Aliexpress but it could not balance all the cells. It charged to 54.3 volt, I thought that's not right so I let it charged overnight it only increased to 54.85 volt. I then discharged it to 52.37 volt. Individual cell voltage before and after discharged:
1. 3.32 3.27
2. 3.57 3.28
3. 3.32 3.26
4. 3.31 3.27
5. 3.32 3.28
6. 3.57 3.28
7. 3.58 3.28
8. 3.58 3.28
9. 3.31 3.27
10. 3.32 3.27
11. 3.32 3.27
12. 3.30 3.28
13. 3.58 3.28
14. 3.58 3.28
15. 3.29 3.24
16. 3.58 3.28
So my question is, is it a faulty BMS or cells but if it is a BMS then why seven of the cells able to charged to 3.58 volt?
So I bought a new 16s 45a BMS from Aliexpress but it could not balance all the cells. It charged to 54.3 volt, I thought that's not right so I let it charged overnight it only increased to 54.85 volt. I then discharged it to 52.37 volt. Individual cell voltage before and after discharged:
1. 3.32 3.27
2. 3.57 3.28
3. 3.32 3.26
4. 3.31 3.27
5. 3.32 3.28
6. 3.57 3.28
7. 3.58 3.28
8. 3.58 3.28
9. 3.31 3.27
10. 3.32 3.27
11. 3.32 3.27
12. 3.30 3.28
13. 3.58 3.28
14. 3.58 3.28
15. 3.29 3.24
16. 3.58 3.28
So my question is, is it a faulty BMS or cells but if it is a BMS then why seven of the cells able to charged to 3.58 volt?