this post was submitted on 29 May 2024
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3 years seems pretty good for using a car battery outside of it's preferred use case. I guess that depends on how good/bad you were about deep cycling it.
Currently, the batteries I'm using are my power tool batteries, which are 18V so they charge through a dedicated (12V) charger, and I have a little USB A/C and low powered inverter that uses them. I probably wouldn't necessarily want to put my lithium batteries through every day cycling, though.
I've thought about generating hydrogen with it to use for experiments and such, but idk if I have the space for that.
Better than that :) They were junk car batteries when I got them, and I still got 3 years out of them. But yeah, they didn't get deep cycled much or at all since there were 2 in parallel and the loads I had on them were very small (5-6 500 mAh cell phone chargers and occasionally some LED rope lights).
When I eventually hooked an inverter up to charge my laptop or run a lamp during power outages, they started to show their age with the extra current draw. I think that's what finally did them in.
Yeah, lithium batteries wouldn't like that kind of daily cycle without some kind of charge/discharge limiter to keep them in the 30-70% range. That's basically what hybrid and EV battery managers do to prolong their useful lifespan. I think LiFePO4 lithium batteries would tolerate that better (they're the ones typically used in e-bikes), but they're not cheap. I've also found it difficult / expensive to find solar chargers for them (to be fair, mine is 48v 20AH so finding any aftermarket charger for it has been a challenge lol).