I use one of my current limited lab supplies, set it to a safe current like 30 or 100mA and the voltage to the max that the battery would charge to, then I connect it to the pack that refuses to charge, after verifying with a voltmeter that the external battery connections are not disabled by the BMS, then I charge just enough that the original charger recognises the pack again and let it finish the charge cycle.
If the BMS has disabled the external contact and you can open the pack enough to reach the cell terminals then you can find the cell(s) that are below minimum, charge them enough that they are well above minimum and pray that your BMS does not permanently disable on the first time going below minimum voltage. You will know when all cells are above minimum and see if the BMS has re-enabled the external battery contacts... On Sun, Dec 10, 2023, 4:05 PM Peter Eckhoff via EV <ev@lists.evdl.org> wrote: > I have a few Ryobi power packs that won't charge. This got me to > thinking I would like to get into trouble shooting and battery > testing. I've found a few sites on Youtube that discuss trouble > shooting and battery testing. A number of sites use a Atorch DL24 [P] > such as this channel: > https://www.youtube.com/watch?v=YQQJHwC4hOY&t=20s > > Are there any battery testers that you have used and could recommend? > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231210/c182de59/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
