vankyan
1 µW
I've got an e-bike which doesn't turn on. The battery reads no voltage at the connection terminals and doesn't charge, but it turns on an reads as half-way charged. Internally the battery cells give 32V, but the circuit board doesn't pass that on to the terminal connectors. I found that a 40A fuse on the board is likely blown as it doesn't pass a continuity check. However, bypassing it reads a positive voltage at the terminals, but it keeps dropping, so something else must be wrong as well.
This is the board's top side. On the left is where the cells connect. The white big connector on the right is the charge check, the small white next to it is for the rear lights (no power there either). The charger comes in the black connector in the bottom right corner.
This is the back side of the board. The white 40A fuse next to the charger connector (bottom right) is likely blown
This is what the battery pack looks like
The pins of the battery connector read:
B1: 3.64V
B2: 7.29V
B3: 10.94V
B4: 14.59V
B5: 18.24V
B6: 21.7V
B7: 25.4V
B8: 29.1V
B9: 32.7V
When I plug in the charger, a small internal LED starts flashing on the board. When the battery cells are connected to the board it flashes slowly, when they are disconnected it flashes faster. When connected the charger pins read 42V/3.3µA
If I unplug the battery cells from the board, the charge check doesn't work and the internal LED is off. They turn on when I connect a charger despite the fuse being blown. They they stay functional even if I disconnect the charger.
Any help or advice is greatly appreciated!
This is the board's top side. On the left is where the cells connect. The white big connector on the right is the charge check, the small white next to it is for the rear lights (no power there either). The charger comes in the black connector in the bottom right corner.
This is the back side of the board. The white 40A fuse next to the charger connector (bottom right) is likely blown
This is what the battery pack looks like
The pins of the battery connector read:
B1: 3.64V
B2: 7.29V
B3: 10.94V
B4: 14.59V
B5: 18.24V
B6: 21.7V
B7: 25.4V
B8: 29.1V
B9: 32.7V
When I plug in the charger, a small internal LED starts flashing on the board. When the battery cells are connected to the board it flashes slowly, when they are disconnected it flashes faster. When connected the charger pins read 42V/3.3µA
If I unplug the battery cells from the board, the charge check doesn't work and the internal LED is off. They turn on when I connect a charger despite the fuse being blown. They they stay functional even if I disconnect the charger.
Any help or advice is greatly appreciated!
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