Waynemarlow
10 kW
OK, sort of a battery mystery. I have a Fazua battery that looks like its completely flat, 2.2 volts on the output wires. On opening it up it has 2 groups of 6 Samsung 18650 cells and 1 group of 5 built in a cylinder type arrangement of the 3 groups put end for end. The BMS looks as though it is a 10S setup with 10 wires leading back to the PCB board. I was expecting 20 batteries in a 10S2P arrangement to output a standard 36 volt lithium setup. To confuse me even further it would seem there is only 1 interconnection between the groups with a +ve at one and a negative at the other.
Now without stripping it completely out, which is going to mean removing the interconnecting wires, how does this setup work, I can only think that the its in some form of 9S setup with 1 battery as a solo battery ( thats got to be tough on that 1 cell ) that is stepped up to 36 volts. But then the charger is a fairly standard looking 36 volt charger with a fancy Rosenberger plug with only the main 2 wires are connected back to the PCB board.
What I had thought to do was to individually recharge each cell and see if they could be recovered, I suspect this bike has sat for a very long time and the BMS has run the unit completely flat. The battery is fairly complex to strip out as individual units, any risk of putting a very low current through at say 30 volts to see if they all will pick up. Even if they only recover say 50% then it maybe worthwhile as a get me home battery.
Any help on this one would be appreciated.
Now without stripping it completely out, which is going to mean removing the interconnecting wires, how does this setup work, I can only think that the its in some form of 9S setup with 1 battery as a solo battery ( thats got to be tough on that 1 cell ) that is stepped up to 36 volts. But then the charger is a fairly standard looking 36 volt charger with a fancy Rosenberger plug with only the main 2 wires are connected back to the PCB board.
What I had thought to do was to individually recharge each cell and see if they could be recovered, I suspect this bike has sat for a very long time and the BMS has run the unit completely flat. The battery is fairly complex to strip out as individual units, any risk of putting a very low current through at say 30 volts to see if they all will pick up. Even if they only recover say 50% then it maybe worthwhile as a get me home battery.
Any help on this one would be appreciated.