Then how did the two cells get to 4.3v as labeled in the picture? The Overkill BMS would have cut off the charge.The cells were first charged in parallel, then assembled in 2p4s and charged with an Overkill BMS. Voltages and current were as in my previous post. Total capacity achieved Was 536Ah. Better than a kick where the sun doesn't shine but the question is, where are my 84 amps?
It's really easy to control in parallel. Use your DMM and set the power supply to 3.65v. Then, don't change it, and connect it to the cells.
All cells in a "group" are connected in parallel .... so will have the same voltage. No problem with a BMS controlling a pack set up that way.
DJ, agreed. I said SERIES parallel. IE:In parallel, even without an BMS, overcharging is only possible if you didn't setup the charger/power supply properly.
When set to 3.65V without any load, it can't go over 3.65V
If it does, there are 2 options
- You didn't set it to 3.65, but higher, eg trying to adjust while connected to a load
- The power supply is failing.
To minimize the risk at #2, it's always recommended to double-check on the cell terminals with a decent DMM. Not all powersupplies have accurate readings, and using 2, you're double-checking it.
I'm sorry but I have to correct this. Some newb is going to read this and be scammed by trash-salesman.LiFePO4 isn't lithium polymer, bloating is NOT dangerous.
It will reduce capacity more quickly, and with it less suitable.
I'm sorry but I have to correct this.I'm sorry but I have to correct this. Some newb is going to read this and be scammed by trash-salesman.
Yes, we agree on the slight bloating isn't a problem.So no, bloat is NOT normal, and should not be expected upon purchase. Something else was wrong, right from the get-go. In other words, those very first picture shots the op had were FINE.
The 4.3V labels are an indication of either faulty charging equipment or lack of understanding of the most basic characteristics of LiFePO4. What happened?
Shipping back to China is very costly. Besides, it's too late for that because whoever paralleled top balanced and tested the cells did it wrong and two cells are severely bloated due to overcharging. The other cells might have capacity loss as well. IMO any warranty has been voided. Did you read and understand the whole thread? What happened here is a shame and I feel for the OP.If OP is quite upset about that, then return as not as advertised.