Yes they do but they only go down a percentage or two at a time, my phone was going completely flat after checking it, two days after switching it off. That was a terrible situation which shouldn't have been allowed to occur, surely?
But also there were other times when it didn't seem to go flat after switching off - and I have no idea what the difference was, or have any way of knowing whether or not next time I switch it on it will be flat - or it will be 75% full! Who could know?
Now I have put it on low power mode, and when it's switched off, it seems to be switched off. Previously it was totally unreliable and I could quite often turn it on to find a flat battery warning and then having to charge it up again - which is totally bad for the battery, and totally out of order for Apple to allow that situation to happen. If it was discharging the battery, surely Apple should've stopped it at a 20% or something and not let it get completely flat. And if they were going to let it discharge the battery, there should've been some warning somewhere, shouldn't there? My previous iPhone didn't discharge like that.
I've no idea what services it was running in the background when the screen was black and it was supposed to be off, but now I have turned everything off; Wi-Fi, Bluetooth, everything and put it on low power mode.
But you couldn't check whether or not there was anything running without switching it on again and it taking a minute to switch on, and no way of knowing what the battery state actually is until it has booted! A bit daft really. - So when the screen is black and you think it's off, surely you expect it to be off - don't you?
Apple should have a tiny light to inform you of battery state when you press a button.
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