I have a Shunbin 200ah LiFePO4 battery in my van (purchased by the previous owner...).
After reading most posts here about troubles with these batteries, decided to open it up and check what's inside ?️
Pics are attached.
What I found out:
- 8 green cells. 2p4s. Hopefully 100ah each (edit: measured 178ah total with AiLi monitor. 11.5-14.3v )
- same poorly soldered BMS.
- unfortunately not connected with busbars & studs (what's the name for the connection in the pic? Laser weld?)
- surprisingly cells were balanced pretty well... All 4 were 3.22v-3.21v. I don't think they were ever manually balanced since purchased.
Now for my questions:
1. Can anyone recognize what cells are they? One had serial number with barcode: E90BD412DE5457.
2. Cells being balanced now (low voltage), does that mean same for when they're full?
3. Does the low capacity can be related to top balancing problem?
4. My thought was to try and squeeze what I can from it- replacing bms for a JBD smart bms & adding an active balancer (like the Heltec 5v). How hard is dealing with the cells & terminals with the connection type I have there?
Thanks for any help! ??
After reading most posts here about troubles with these batteries, decided to open it up and check what's inside ?️
Pics are attached.
What I found out:
- 8 green cells. 2p4s. Hopefully 100ah each (edit: measured 178ah total with AiLi monitor. 11.5-14.3v )
- same poorly soldered BMS.
- unfortunately not connected with busbars & studs (what's the name for the connection in the pic? Laser weld?)
- surprisingly cells were balanced pretty well... All 4 were 3.22v-3.21v. I don't think they were ever manually balanced since purchased.
Now for my questions:
1. Can anyone recognize what cells are they? One had serial number with barcode: E90BD412DE5457.
2. Cells being balanced now (low voltage), does that mean same for when they're full?
3. Does the low capacity can be related to top balancing problem?
4. My thought was to try and squeeze what I can from it- replacing bms for a JBD smart bms & adding an active balancer (like the Heltec 5v). How hard is dealing with the cells & terminals with the connection type I have there?
Thanks for any help! ??