I never changed charge on a cell before releasing it. Just don't charge it without compression. Note that not all cells will generate the same amount of gas, some cells bulge excessively and other cells under the same compression, temperature and current, look much better. Apparently slight variation in electrolyte chemistry make a big difference. You see this with the gen1 Surface laptops that were splitting themselves open from bulging cells, so much that Microsoft gave a 3 year exchange warranty, which we missed because they counted from date of order, while the 3 week delivery date was well within the 3y limit. Oh well. I ordered a replacement battery, managed to unstick the original 4 cells and am still using it as backup laptop. Now, the 4 original cells puzzled me. They were 2 parallel, 2 pairs in series. 3 cells were bloated. 1 cell was flat, no gas production whatsoever. All 4 cells were in good working order. The unbloated cell was always at the same voltage (SoC) and temperature and charge/discharge current as the other 3. Why was 1 not bloated? Must be a difference in electrolyte composition... Cor.
On Fri, Nov 7, 2025, 6:45 PM (-Phil-) via EV <[email protected]> wrote: > It's of course much safer to discharge as low as you can, (3v/cell) but as > long as you restore the compression to the nominal value on the stack it > will be fine. > > On Fri, Nov 7, 2025 at 6:39 PM Mr. Sharkey via EV <[email protected]> > wrote: > > > Anyone have a take on releasing the compression holding a 10-module > > stack of Gen2 leaf modules that are (at least) partially charged (not > > full)? It's time to disassemble the pack in my Electrak and swap out > > two under-performing modules. I know these modules swell up when > > charged, but once charging is stopped, and they sit for a while, is > > it safe to disassemble to the pack as-is, or should I discharge it? > > > > If discharge, how much? A volts-per-cell (half module) value would be > > useful. > > > > _______________________________________________ > > Address messages to [email protected] > > 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/20251107/331c16de/attachment.htm > > > _______________________________________________ > Address messages to [email protected] > 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/20251107/c65bc0d3/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
