Is it possible 8.1 reads the battery charge differently than 9 and 10?
I am sure it is because of this. What I have observed is that, if I put my device in airplane mode for a few hours starting at around 80% charge, it ends up with 70% after 6 hours - and when I take it out of airplane mode to use it, it shuts down immediately. But, if I keep using the device, it works fine all they way down to 10% at least.
If I turn on the phone after the sudden shutdown, it is still at 50% charge sometimes, and at around 30% sometimes too. But it is nowhere near the 60-70% which it was before the shutdown.
I think the battery is being read worng when the device is sleeping and a sudden drop in charge triggers the shutdown.
And it is possible that changing the battery is somehow resetting or fixing this behaviour of reading battery stats. Which would mean loads of people are unnecessarily changing their batteries
I'm getting a new battery shortly.. will test the old one once I have replaced it.
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