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I’ve taken two things away from my attempt to resurrect this defunct battery pack. 1. Once the “charge complete” indicator comes on on the charger, then absolutely no further charging is going to take place (not even a trickle). 2. The final voltage that the pack achieves when the ‘charge...

I’ve noticed a swytch BMS uses the same connections as the overheat thermistor - putting the switch in series with the thermistor.

… and before you say it - No, I don’t keep the packs in the tent (or car)!

I’m trusting that I’ve vented the ammo boxes enough so that IF a pack ever went up, then I’ve got it so the gases can escape rapidly enough not to explode the ammo box! I keep them in the garage with nothing too combustible close by. I must try and not to be somewhere that people can get rid of...

So the “charge completed” light on the charger is not exactly a charger function - even though it’s on the charger. It’s triggered by a cell group reaching 4.2v, the BMS therefore turning off it’s charge input, and when the charger senses no load it turns the green light on? Hence the green...

Hi Neal. I’ve got load resistors pulling down the “high” banks at the mo. I should have them all within 0.1v by late tomorrow. I can then try a pack charge again. I’m still assuming the pack is not viable because something put it out of balance (partial charging maybe). Once I get it in balance...

Fully accept what you say re safety. I work on my batteries using an ammo box, and frankly I charged via the output by mistake. So the mechanism coming into play here, is a cell group has reached 4.2 - and the BMS then shuts down - cool. I assure you I am no fool - I’m a 50 years plus fully...

I’m just going to discharge the pack down to 35v - to see if the BMS will charge from that voltage. Maybe something’s open-circuit?

Hi. I’ve inherited a 10S 2P battery pack that won’t charge to 42v via its BMS. The charger is giving 42.5v at the charge port of the BMS, and thinks that the battery is fully charged (green light on). The cell pairs measure 3.9, 3.8, 4.1, 4.2, 3.9, 3.9, 4.1, 3.9, 3.6, & 3.8, with a total value...

I respect your wisdom on such matters. My reasoning that the packs should be happy with 2A - 4A charge rates, is that we discharge them (when we are riding) at this sort of rate.

Hi. I’ve gained a number of swytch 2A chargers which are of good quality. 2A is great for my 5Ahr swytch packs as I can top them up to full in less than two hours if the weather looks good and I get the urge to go riding. On my 16Ahr Yose pack, I’m now thinking of charging it occasionally using...

I’ve ordered up my MH-609 circuits (ebay, two for six quid). I shall baseline all my packs in the way described. I’ve had a few battery packs (from a couple of swytch bikes I’ve now converted) and I really don’t know how capable they still are, so this will help me take a view on that.

Fair point. It may be just a matter of gaining confidence with each pack. I always charge to full before a trip - because I then know what the battery has to give, and how far it will get me. A half-charged battery is an unknown to me at the mo.

Thanks. I like your style - I love a good spreadsheet! I shall read and absorb…

I like the immediacy of the swytch packs. It was a nice morning, so at 8 o’clock we decided to bike the eight or so miles to a pub at Otterton. By 10 o’clock the batteries were charged and ready. My big pack would’ve taken four hours to fully charge. I’m now wondering if my Yose pack would be ok...

Thanks both. I’m learning!

Good to know. I was thinking 38v was a good target, but happy to be corrected to 40v!

Result! Thank you Nealh. I set P1 to 192 and all seems to be well. All the posts I’ve seen on using a Swytch hub talk about P1 being 96 so not sure why my wheel should be different. Here’s what has been posted before:- Swytch hub is (6:1 Ratio) 6 x 16 Magnets in the internal Hub, so P1 = 96...

Thanks. I’ll try it and report back.

Having spent a few months using relatively small Swytch battery packs, I bought a rather large 15Ah Yose battery pack. I can now see merit in having smaller packs available, as firstly they charge a lot quicker - I’m conscious that it’s best-practice not to keep partially charging as the BMS...