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Written by Wandering Hermit on 2025-01-13 at 19:04

I recently found that many cheap AC chargers for LiFePO4 batteries don't actually trickle or float charge, even if the product listing says they do. They charge the battery to full and then shut themselves off. They must be power cycled to restart charging.

So the instrument attached to the battery (with charger connected) ran until the battery was discharged, then shut down and lost data. This is a scientific instrument in the basement that requires 12VDC even through power outages, and after the last lead acid battery died I switched to LiFePO4.

My tentative solution is to put the charger on a 7-day timer, and once or twice a week turn it on for a few hours.

[#]science #BackupPower

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