Impulse battery charging fault

[NigelC]

The 17Ah Impulse battery on my Kalkhoff eBike will not accept charge. I have tried using an identical charger to no avail so it is not a charger fault. The bike display shows the battery as partly discharged and the motor works fine. I have stopped using the bike until I find out what is wrong with the battery. The battery is about 4 years old and has probably been charged about 20-30 times.
Any suggestions much appreciated.

 

[flecc]

These batteries have a sleep mode that protects them when not charged for a long time, so it may have gone into that mode. Normally connecting it to the charger wakes them up, but clearly that isn't happening, so try the capacity check next.

To do that, hold down the battery level button, but this time for more than ten seconds, after which it will show the battery capacity, that is the amount it could accept, not the amount of charge it has.

Once you've seen that, try connecting the charger again to see if it starts to charge then.
.

 

[NigelC]

These batteries have a sleep mode that protects them when not charged for a long time, so it may have gone into that mode. Normally connecting it to the charger wakes them up, but clearly that isn't happening, so try the capacity check next.

To do that, hold down the battery level button, but this time for more than ten seconds, after which it will show the battery capacity, that is the amount it could accept, not the amount of charge it has.

Once you've seen that, try connecting the charger again to see if it starts to charge then.
.

Tried that. Having opened the case I have measured the voltage across the battery terminals. It is 10v so the battery is confirmed as permanently dead. I suspect that it was a faulty BMS.