Quote:
Originally Posted by j.p.s
So deep sleep renders airplane mode irrelevant if that is true.
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Well perhaps not quite irrelevant. There is more drain if the Kindle is put into deep sleep without airplane mode. So there is probably some minimal watchdog activity going on. But battery drain still doesn't stray far from what we would expect from simple self-discharge of the battery.
Deep sleep + airplane mode was about 5% drain /month
Manual shutdown command brings that down to 3% drain /month
Which for the PW4 is probably just the residual self-discharge. And FWIW, an apparently efficient battery protection circuit. As ever, we can't have all of our cake and eat it too. There are always trade-off's and they may well impact boot time as you implied. It would take a lot more trials to flesh out the fine details of battery use for every scenario and there are confounding factors such as the non-linear battery drain from 100% charge state i.e. we would see a more linear drain if the test started at 95% or less.
But ilovejedd has done most of the work for us and we can see the relative battery drain in common usage situations. We can pick our poison at least in terms of ease of use vs maximized battery life.