Bosch PowerPack 400 battery completely dead after deep discharge – is there any way to recover it?
I bought a used e-bike with a Bosch Performance Line CX motor and a Bosch PowerPack 400 battery. It came from Belgium without the battery key or charger.
When I first got it, the battery still had one flashing LED, but since I didn’t have a charger, I couldn’t test or charge it. Unfortunately, it then sat unused for about a year.
Now the battery is completely unresponsive. Pressing the button does nothing, and no LEDs light up. The battery is still locked on the bike because I don’t have the key.
Also, there are no Bosch e-bike workshops in my city.
Has anyone dealt with a similar situation?
Is there any chance the battery can still be recovered after being deeply discharged for so long?
Can a Bosch charger wake up a battery like this, or is it likely permanently dead?
If the battery’s BMS has shut it down, is there any way to reset or recover it?
I’d appreciate any advice or personal experiences. Thanks!
(Generated from chat gpt because I don't know English well)