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Thank you all again for your advice and offers of help. It may be sorted! I made up a 4v charger from an old power supply and charged the bad string to 3.7v. That allowed the output to switch on. Put it back on the bike and took it for a gentle run to discharge the pack a little. It was...

Thanks for the advice. I will try to charge that string. The bike had been unused over the winter. If that fails and I am unable to get replacement cells, would it be possible to reduce the overall capacity by removing one cell from each string and then using some of those to replace the...

Hi, Thanks again for your replies. Yes, that string of cells reads less that 0.5v. All the spot welds seem sound as does the soldering. What options do I have to get the pack working? Ian

Hi, Thanks for the prompt replies. The reading across the pack was 37.6v The readings for the white wires are: 0v 4.1v 8.2v 12.4v 16.5v 20.8v 21.1v 25.2v 29.3v 33.5v 37.6v (The readings alternate from the connectors on either side) Does that mean that the cell group between 20.8 and 21.1 is...

Hi, I am new to this forum and looking for some help. I have been running electric bikes for a number of years and in the past couple of years changed over to Li cells rather than lug about Lead acid. I now appear to have a problem with the output from my 36v battery pack. I measured only 5.2 v...