The charge tests and the power tests were one if/elif chain. If mains power returned while the charge was below the warning threshold, the loop did not report it, did not cancel the shutdown, and did not clear the flags for the next power failure.
The power tests now run first, on their own. The charge tests apply only while the battery discharges for two consecutive readings, so a low battery on mains power starts no shutdown. A device that reports no battery current is judged by its charge alone.
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