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[–] 2 points 1 day ago* (last edited 1 day ago)

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.

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