nukezero
10 kW
So we got this new 36V 15Ah LifePo4 pack from Sunthing28 on ebay. The charger puts out 45.2V. The problem is that the charger is shutting down at around 39.5V. We can only get a range of about 5 miles before the battery hits LVC. After one hour of charging, the battery goes back up to 39V. The battery pack has been cycled for 3 days now with the same result.
The pack is supposed to be capable of being charged up to 44V+ according to sunthing28. We tried a different charger that puts out 42V, and that charger also shuts down after 39V.
At first we suspect that the battery has no BMS, but why would the chargers shutdown early if a BMS doesn't exist? The charger should just continue to charge the pack for as long as it can up to 44V no ? Sunthing28 says the bms is inside the pack, but we can't know for sure until we tear the pack open.
Second, is it possible that perhaps one cell is disconnected or not secured to the BMS properly? Therefore, the BMS is shutting down the charger early resulting in the other cells not getting their full charge?
Thanks for the help!
The pack is supposed to be capable of being charged up to 44V+ according to sunthing28. We tried a different charger that puts out 42V, and that charger also shuts down after 39V.
At first we suspect that the battery has no BMS, but why would the chargers shutdown early if a BMS doesn't exist? The charger should just continue to charge the pack for as long as it can up to 44V no ? Sunthing28 says the bms is inside the pack, but we can't know for sure until we tear the pack open.
Second, is it possible that perhaps one cell is disconnected or not secured to the BMS properly? Therefore, the BMS is shutting down the charger early resulting in the other cells not getting their full charge?
Thanks for the help!