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A slim chance, but if anyone lost a wheel, which I found this morning (Mon 25th May), I know where it is. Presumably it fell off a car because whoever lost it didn't ride home..

Thanks again, and yes, Jimmy will be fitting the Boston Power Swings....

I soldered two pins to a 5V phone charger, checked the polarity and connected to B-/B1. The voltage of the cell was 2.98V when I started, and after charging for 2.5 hours the voltage was 2.97. I checked the output of the phone charger at the pins before and after the session and confirmed that...

Well although the battery output and individual cell voltages declined significantly over the week the output of the battery charger remained exactly the same, suggesting that the meter was not the variable. Moreover, the new readings were obtained before changing the meter batteries, which...

OK, but there is also the mystery of the voltage drop over this week. Individual cell groups measured 3.70 last week, but still wouldn't charge.

My meter doesn't have selectable voltage ranges, it scales automatically. Something doesn't add up though. As I understand it the two methods are essentially measuring the same thing but in different ways, and reading along the cells from B- should show a cumulative addition of the individual...

I repeated the B-/B1, B1/B2, B2/B3 measurements several times with the new batteries in the meter, and got very consistent results with all ten cell groups reading either 2.97 or 2.98. Measuring from B1 to B10 using B- as the neutral gave noticeably more erratic results, as above, with three...

These are the readings with new batteries in the meter. They were taken from the pins in the plug after first disconnecting the plug from the BMS. For each reading I held the probes in place until the meter gave a steady reading, and where the values differed from those I had obtained previously...

OK, I'll replace the meter battery and report back. Could a fault with the meter explain why the two methods of measurement gave such different results, which were consistent as I measured them several times?

Curioser and curioser.. I rechecked the output voltage of the battery, which was 37.2V last week, to find it has now dropped to 29.9V. I then rechecked the voltages of the original cells, which were previously all 3.70 or 3.71V, to find that they are now all between 2.97 and 3.01V. These seem...

Thanks Nealh, but is there anything else it could be now, apart from the BMS?

I know, I'd convinced myself that the cheap charger was going to save the day, but I need some idea of where the problem actually lies before I start investing in battery resurrection. Let's hope Nealh can help... I believe a BMS can be replaced, but with an 8 year old battery it might not be...

My 2A charger arrived today, and I was hoping to be posting to say that all was well and the bike was charging again, but alas no. I checked the polarity and output of the new charger, plugged it in, and it sat there shining its annoying green light at me just like my original charger. Is there...

Thanks Benjahmin - I also had a look to see if i could modify my cable run as you suggest, but it isn't long enough, and only just reaches the battery as it is.

It's much kinder to the wallet too, so this is welcome news thanks Nealh..

Thank you both for all your help so far, which is much appreciated, but I need to decide on the best way forward from here. Would you agree that the fault most probably lies with either the charger or the BMS, and that the result of the bulb test points a finger towards the charger? That being...

You obviously have excellent taste. This one has lasted since 2012 albeit with a replacement LED display and controller. Thanks for the tip, but it isn't going out in the rain, in fact right now it isn't going anywhere.. The relay still clicks, as usual, but normally that precedes the yellow...

You were right, it was the bottom pot, but I turned it down to 41.7v and the charger still refuses to play.

Here you go, my pride and joy.... It's a classic 1990's Reynolds 531 road bike, which still fools most of the boy racers nowadays, which is why I'm so fond of it and so keen to get it back on the road. :cool: Thanks for the sensible pot turning advice, what voltage would you take it down to?

I still need to know which pot to adjust to what, but who is Nigel? Elaine