I just want to say that many of us who have purchased an iPhone, regardless of model types, have spent quite a lot of money. Shouldn't we be using and turning on functions that we want to use (location/background app refresh/etc) and still be able to experience the battery usage/consumption span that is realistically acceptable?
I think all the tips about maximising batteries and turning off this or that does NOT solve the problem of the unfortunate "premature battery drainage" which comes with the iOS update. This is unfair to all users and I suggest that somebody in Apple should address this problem as they would for the latest battery replacement scheme.
My iPhone 8 plus battery life was so good at iOS 11.2.2 until I have updated the software. I have updated the software as I have been experiencing call drops and cancellations. This is infuriating. I don't see the need for me to turn off this or that because I might as well buy a simple Nokia phone and forget about all the wonders of what Apple has to offer. Are we paying money for empty promises? Listen Apple, I am feeling it already.
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