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The voltage was holding up after 12 hours at a full 42v. with the BMS connected, so I've put the battery back together again. Later in the week I'm hoping to do a 30+ mile test run to see if it cuts out and how much range it has. My hybrid has a downtube battery mount and I've screwed a spare...

I will do. After 12 hours the suspect cell group is holding up at 4.2 volts. I'll give it another 12 hours, and if it's still OK I'm going to reconnect the BMS and take readings at 12 and 24 hours. That should help determine whether there is a cell or BMS problem. After that it's a ride into...

No. Charging to full (green light) then using the bike immediately after - usually a couple of miles or so to lower it a bit. As an aside, I contacted Yose Power about this when it was 2 weeks from the end of the 18 month warranty, After much explaining and sending several videos with meter...

I'm leaving the BMS disconnected for now to check whether any of the cells lose charge over the next 24-48 hours. All the other cells seemed to hold full voltage over the last few days. The battery has had regular use, never been run down below about 36 volts and used straight after full...

I set up the battery outside today and managed to lift the low 3.4v. cell group to match the others at 4.2v., giving a full 42v. battery voltage. Using the Garmin 5v. 2A. charger it took around 3 nerve-wracking hours. All the cells were cold throughout. The final 0.2v. seemed to take forever and...

Hmmm... Now you've tempted me! I want to do this outside and the forecast isn't good for the next couple of days. Perhaps I'll set it up for a short while on the next dry day and see how it goes. That ebay charger and socket is less than a tenner anyway so no big deal if I do charge the battery...

After the very welcome input from Ghost1951 and saneagle I've been giving this a bit more thought. Although I'm sure it would work, I'm a little concerned that I might not be able to accurately charge up to 4.2v. with the Garmin 5.35v. charger. I certainly don't want to complicate things by...

Thanks for the replies guys, I really wouldn't be attempting this without your help. I realise that the charger is capable of overcharging and intend to keep a close eye on proceedings to avoid going over 4.2v. It's a 13 Ah battery so using saneagles' calculation it should take just under 2...

The pin header strip arrived today, so I've made a 2-pin charging cable from a USB lead that came with an old phone charger. Having stripped back the outer insulation and shielding I was able to confirm my assumption that red is positive and black is ground with my multi-meter :- My eyesight...

Not at all. This is what you posted yesterday in the Argos folder thread:- "I made good progress today after getting out of hospital yesterday pretty well cured. I will continue the thread shortly, but I've encountered a bit of a setback that I'll explain in another thread." I mis-read that to...

Thanks! I really want to explore the possibilities and learn along the way. Hopefully it might help others that experience similar problems. I will post photos in stages to make sure I'm not going to burn the shed down! :D I think it's a shame there isn't a "sticky" function or an FAQ section...

If anyone is following my quest to solve the battery problem, I opened it up again to measure the BMS pins. They are 2mm pitch and about 5mm long, so those suggested by @saneagle are too big:- After a quick search I found a UK supplier of a male pin-header which I can make a 2 pin connector...

Thanks once again for your time and free advice - it's what makes this forum so interesting and is much appreciated. I just need to open the battery (again!) to check the pitch of the pins on the BMS connector before I order one of those connector strips. Just so I've got this right, I can make...

Thanks Saneagle. I m must admit I was expecting an out of balance cell, but the difference in the BMS input and output voltage has thrown me somewhat. Yose Power will supply a replacement BMS (£25.00 inc postage) but I'm not sure it will make any difference. I've already tried leaving on charge...

Opened up the battery again earlier today after leaving it connected to the charger for a few minutes. It was already showing green. It has always measured 41. something volts hot off the charger, but this time it is only 39.1 - the lowest it has ever been after charging. Measured the cell...

Thanks Saneagle. I've had the battery open and found the multipin connector. I've put it away again for now as it's not a priority. I might open it up again at some point. I recall that the connector had a black wire at one end and a red wire it the other (white wires in between). What are those...

Thanks for the super-quick reply! I've actually been using silicone (electrical) grease since day one on my connectors. You have prompted a thought though. I might have an intermittent faulty switch, so I could bypass it and see if that solves the problem. Thanks again! I'll certainly consider...

I have three bikes kitted out with Yose Power 36v kits, and until recently they have shared one battery - because I can only ride one bike at once! The battery is a 36v 13Ah HL1, with the 5 gold round pins. https://www.yosepower.co.uk/products/36v13ah-hl-i-down-tube-lithium-ion-e-bike-battery...

That's an interesting idea. I thought about making some, but they're only £3.64 inc. VAT and postage on Aliexpress. I've ordered some to try:- https://vi.aliexpress.com/item/1005007250181380.html?spm=a2g0o.order_list.order_list_main.5.63591802GZvjy9&gatewayAdapt=glo2vnm

Very true, but ATM a step-through is just a "nice to have". In a couple of years time it might become a "need to have". Until then I'll just make do with what I've got, not least because I've been told by the domestic authorities that If another bike arrives I'll be sleeping in the garage with...