Cosmic Meow Backgroundpicked up 1825 li-ion battery packs today. that’s 5475 18650 cells in new old stock 3S1P packs.
that will be a lot of work to repurpose and test the packs/cells. but hey, if it’s free it‘s free.
testing one from the 2023 batch and it’s still over 3V per cell. charging it right now and all seems fine. nice :3
that gives enough time to build a many channels charger jig with monitoring etc.
that gives enough time to build a many channels charger jig with monitoring etc.
opened up another pack. it's complete with full bms, balancer, conformal coating and just really good construction. neat.
ftg@ftg they’re already usable as is, still trying to come up with a way to use them safely in series for a higher voltage pack.
or maybe someone needs a lot of packs for some badge project
or maybe someone needs a lot of packs for some badge project
qualia@cmb this has me wondering again if anyone makes a low-cost Fluke 500 equivalent. a kelvin probe miliohmmeter is great for a super quick cell state-of-health assessment
i covet the one we have at work but not $5k+ covet. i'd guess it's just doing 10kHz AC impedance testing through its fancy coaxial pogo-pin probes but i'm not certain
Z̈oé
Andrew Zonenberg@cmb hope you're storing them outside or something that's a lot of dubious batteries
@azonenberg it‘s not dubious actually, they‘re leftovers from a portable spectrometer (first device gen has been discontinued) with bms and all produced in germany with datasheets and everything.
@cmb that's still a lot of stored energy, how many gallons of gasoline equivalent is it
@azonenberg that’s around 7 liters of gasoline in energy
@cmb ok yeah I wouldn't store that in my house either :p
@azonenberg eh, it can be stored safely in a jerry can imo. for the batteries we‘re getting a proper storage rack too
Mallory's Musings & Mischief@azonenberg @cmb oh, come on, you wouldn't store 7 liters of gasoline inside your house? What a wuss lol
@malcircuit @cmb i mean i have a couple of liters of ipa and acetone but they're in my lab, in a proper double walled flammables cabinet.
Dang, by my rough estimate, that's something like 50-60 kWh of energy! That's like 2/3 of the battery in my EV!
@malcircuit @azonenberg we‘re transporting them in a polestar 2 which increases theoretical capacity by 60% but effective capacity is still the same :(
Stupid physics. It's only a few hundred kilos of added battery mass. Surely that doesn't affect the efficiency lol
Cutie-PHY@cmb Hmmmm 🤔 how about a battery trailer for a EV? https://www.youtube.com/watch?v=yfgkh4Fgw98
