Air Console battery gave up the ghost. Then it failed to start up at all. So I took it apart and found that the dual-18650 battery pack could be disconnected.

I was surprisingly able to run it with no battery (plugged into USB power), so I reassembled it without the battery and will just use a battery bank from now on.

I have no idea whether the batteries themselves or the charge control circuit failed, but with the internal battery connected, it won't boot.

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the cells are roughly 2.6v (well below the ~3.1v cuttoff the DW01 was supposed to enforce).

I'm going to assume the cells are wrecked and the charge controller is faulty.

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