Alright, y’all were 100% right! I’ve got an imbalance of cells with all 3 batteries.
Battery #1
Cell 1 - 3.55 volts
Cell 2 - 3.67 volts
Cell 3 - 3.30 volts
Cell 4 - 3.34 volts
13.86 total voltage
Battery #2
Cell 1 - 3.50 volts
Cell 2 - 3.60 volts
Cell 3 - 3.29 volts
Cell 4 - 3.35 volts
13.74 total voltage
Battery #3
Cell 1 - 3.47 volts
Cell 2 - 3.59 volts
Cell 3 - 3.30 volts
Cell 4 - 3.40 volts
13.76 total voltage
While it was apart, I was also able to read the info on the BMS modules. They are xiaoxiang model# JBD-TP04S006 and are rated at 100 amp each.
Each battery is 4s1p, each battery has its own 100 amp fuse, and all batteries are then wired in parallel outside of the enclosure.
Now that I see we have a big imbalance issue, I’m thinking about changing things up. It appears as though these cells may in fact have a pretty good capacity still. So, I’m thinking about rebuilding this battery into a 4s3p pack and buying a 300 amp BMS that has Bluetooth so I can remotely monitor cell voltages. I’m also thinking about buying a couple of 4’ long sticks of 5/16” all thread, connecting all of the cells in parallel with each other, and putting a small 1 amp charge(that’s all that I can do with what I’ve got) on them to help balance the cells for a couple of days prior to building the new battery. I’ve learned a hard lesson of the importance of being able to monitor individual cell voltages!!!
What do y’all think on this?