OK, so after 3 hours, the battery voltage has gone up to 4.07V, which is getting close to fully charged. At least that works, no need to source a spare battery.
Unfortunately, having reinstalled it in my Kindle and retried Kubrick, no luck. Each step only takes a few seconds before the green bar appears, which is much too fast.
I suspect that it either never gets into downloader mode, or doesn't stay in it for long enough for anything to complete.
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