iPhone 6s Plus Flat Battery
Hi all,
Very recently (last 4 days), my iPhone has been playing up on charge. To keep a long story short, it died as per usual last Saturday (I let it run flat, which I prefer not to do but not out of the ordinary). I then noticed that after hours of it charging, it wouldn't turn on despite symbolising it was charging. Keeping in mind I have had no problems with my charger until now and my other devices still work on it - I was a bit confused.
When I became increasingly concerned was afterwards, a further two hours of charging (six total), the screen was black. Not evening signalling it has been charging. After awhile I decided it was not worth having it charging if it was battery dead, I unplugged it.
Next morning (Sunday), I put it back on charge because I needed it, and according to the screen, it was charging again. A couple of hours passed and it was alive again, somewhat of a relief at the time.
Completely my fault, I have made this mistake of letting it run dead three times in the last four days. Repeating the same process (dies, on charge with charging symbol, then no symbol, take it off charge for awhile, put it on charge again, time passes its alive again etc). It is only now I am concerned, it hasn't turned on for 24hrs.
Can someone correct me in saying this is because it only retains 70% of its battery capacity in 3 1/2 yrs of use?
TIA.
iPhone 6s Plus, iOS 13