Comment 9 for bug 1512211
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| Matthew Exon (ubuntubugs-mexon) wrote | #9 |
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@pat-mcgowan:
"The battery then decides that charging is over and automatically switches off."
This model of battery pack tries to figure out when the plugged-in device has got to 100% charge, and when it detects that situation it switches itself off and stops supplying power. It then won't supply any more current until I switch it back on by pressing a button on the front. Presumably the idea is to save power by switching off both the battery pack's and the device's charging circuits.
In this case I have a phone at 60% charge and I want to top it up. I plug it into the battery and it starts drawing current. Then I go to sleep. After a couple of hours the phone is at 100% and it stops drawing current from the USB battery. The battery detects this drop in current and switches itself off. But the phone's screen stays on. After a while it would like to top itself up again, but the battery is switched off and won't supply current until I press the button. So the phone just keeps draining itself until I wake up, by which time it's back to 60%.
This is a fairly normal USB power bank, brand name Anker (but likely a fake). I'm pretty sure I've seen this behaviour in other battery packs.