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Unlimited power!
(lemmy.nz)
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this post was submitted on 09 Nov 2026
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Put it on a wooden shelf and let it sit. You certainly won't regret it.
This is the aftermath of a spicy car battery that was used as backup power for some emergency lights in a community center. Blew up in the early morning, burned the plastering from the wall and covered the whole basement in smoke and soot. Fortunately someone was there and heard the fire alarm, otherwise the whole building would have burned down.
Do car batteries work well as a backup battery (not counting the explosion of course)? I assumed they would require an alternator or else they wouldn’t hold much of a charge. I know very little of cars obviously.
A typical UPS (uninterruptible power supply) that's used for computers/servers is basically powered by a small car battery (12v nominal voltage, lead acid battery).
Sump pump battery backups are also typically a lead acid battery, though they're typically a "deep cycle marine" battery, which basically means they store more energy than an equivalent sized car battery.
Oh, this makes more sense. I never thought about a powered UPS as being similar to a car battery with an alternator.
An alternator is actually just a small generator! It converts rotation (from the engine spinning a pulley) to ~13v to ~15v DC at up to some level of current spec (usually 50Amps or more). Some of that goes to the battery to charge it, and some goes to powering accessories in the car.
A UPS simply has an AC to DC charging circuit to perform that function, converting mains electrical voltage (~120v AC in the USA, varies by country) to ~14v DC.
To add the little bit I know to the comments above.
Car batteries are not the same as AGM (often sold as scooter or marine batteries) or newer LiFePO4 batteries.
While I think AGM and car batteries both are lead acid, car batteries are designed to have one big discharge to start an engine and then recharge from an alternator. The other batteries are designed for a slower discharge over time.
The batteries commonly used in battery backups were usually AGM type, and now the LiFePO4 (usually used for solar) are starting to be used for backups and are much safer (I think they don't off gas as much?). The original post was a picture of a solar battery, but an SLA (sealed lead acid, of which some are agm) one from harbor freight.
🤯
They're cheap, but fine. You should have a proper battery maintainer or smart trickle charger attached. A good one will tell you if there's a fault with the battery.
At least it wasn't sitting on concrete. The building would be leveled. /s
Tell that to the person who wanted to be cheap and used a car battery.
Yeah, not worth the saved money...
Absolutely. I haven't been told the final costs of the renovations yet but from what I've heard, they had to completely rip out everything from the room you can see in the background to get rid of the (lead-contaminated) soot.
Also, it was pure luck that everyone got out unharmed. I rent that place twice every year to spend a couple of days with friends who live all over Germany. One of them had all his stuff in the room behind the fire. The only reason he hadn't been in there when the battery exploded was that the night before he hadn't slept well on his air mattress and had moved to a couch upstairs. The room has a fire exit but depending on how fast he would have woken up, he might not have found it through the dense smoke.