[bj784]

I've been using koreader almost exclusively on my kindle PW3 for several months now, and overall I've been very pleased. However I'm wondering about battery life.

For most of that time, I've seen about 4% per hour of battery usage in KO-Reader. But for a few weeks in January, suddenly my battery usage dropped to around 1.8% per hour! No change in usage, no settings changes. Mostly the same epub files as before, same usage patterns. Then my device rebooted, and usage has gone back up to 4% per hour. Again, no changes to settings or anything.

This all happened while I was running version 2022-11. (I think the battery life increase happened about the time I upgraded to 2022-11; I remember thinking it might have something to do with the touch rewrite mentioned in the release notes.) After the reboot and battery life went down again, I tried upgrading to 2023-01 to see if that would help: it didn't.

I'm curious if this battery usage is typical? Do most people see 4% per hour usage, in KO-Reader, on a kindle? Can anyone think of an explanation why my battery usage dropped so drastically for a few weeks? I'd like to understand why, and if possible it would be great to bring the battery usage back down.

I almost always run in airplane mode (always for the purposes of battery percentages). I stay in KOReader pretty much all the time.

My PW3 (7th gen) is running firmware 5.14.2, with KUAL e3deabf (2022-02-13), running USBNet. (Latest versions when I jailbroke last August or thereabouts)