Gregory's Servernow that I have a battery tab welder, I'm going to see how hard it would be to repair the main battery pack. it's hard to get the case open!
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 here we go! it's a set of three paralleled cells. they are way out of balance. (L to R) 3.604V, 2.375V, 3.335V. @tubetime is it worth trying to manually rebalance or just replace the cells?  @tubetime tried something like this before and was already aware that the controller might brick the pack if it sees one cell being disconnected but even with external voltage divider and voltage it bricked the pack, maybe some intermediate connection, no chance to revive it… @fesix yeah I've heard that for some packs. I'm not sure it's the case for this one so it turns out that the original cells, Panasonic CGR17670HC, are long since discontinued, and the 17670 form factor is also gone. folks seem to recommend using 16650 cells instead. @tubetime I've tried looking for new ones a while back but they're rare these days. Might be a bad idea but a lot of Acer laptop batteries from 2010-2015 had Sanyo 16650s in them @tubetime @tubetime flashlight and vape stores tend to be the best. Those are pricey cells compared to the 18650 though. @tubetime nearest i could find is 17500 at batteryspace. dont be too weirded out by their 90s website, weve ordered from them at work, theyre okay. https://www.batteryspace.com/panasonic-li-ion-17500-cylindrical-rechargeable-cell-3-7v-830mah-a-size-3-07wh-0-25---un-38-3-passed.aspx @tubetime Odd question, what tab welder do you have/would you tentatively recommend for very casual/light use? I've been looking at getting one or maybe building something to occasionally rebuild packs and the reasonably priced options are kind of sketchy looking. (As if building one wouldn't be even sketchier! :P) But if they work fine, hey! @lothus i got a Seesii capacitive one. i don't trust the ones that short a Li-Ion battery into the probes... |
yeah lots of wedges but it's coming apart