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Ive had a couple samsung cells that even sitting overnight on the charger their voltage just doesnt rise, most likely high IR...

Hi all, do any of you have any ideas on the best way to discharge test a 3.7v nominal 18650 pack? i use it as a solar powered power bank so at the moment i'm just using it to charge stuff through a USB current logger, but of course its going to take forever since at the bare minimum there'll be...

I can usually peel off the nickel strips with a pair of pliers and just rolling it up, havent found a pack yet that that hasnt worked on^^

Damn, wish i saw this yesterday cause i just threw out a lot of dead cells... local council does recycling for em, ill let you know when i get some more duds, my luck with recycling cells has been pretty good recently!

Couldn't find these in the database, some Panasonic CGR17670s which seem to be fairly rare, don't see many posts about them

Hey all, so since i'm sick of having my RPis corrupt after a couple sudden poweroffs here and there and after a power outage yesterday that entirely killed one of my SD cards, i decided to make a very low effort UPS for my main one. I use this one as a server for Pihole and also as a web server...

Hi all, fairly new around here, i have a 6v solar system set up with just a couple 6v1w panels (6 to be exact) to charge a bank of 18650s, does anyone have any recommendations for high efficiency and fairly low cost solar panels?

I found my way here after getting bored and searching up some cells in my tupperware-box-of-cells-i-ripped-out-of-old-laptop-packs (tm) and stumbled across the cell database

Yeah, i mainly get my cells from old laptop packs and i've had a couple VERY rusted ones come my way, just toss and move on cause i don't feel like a) getting tetanus b) burning my house down with a rusted battery