My iphone wont turn on full battery - Apple iPhone Smartphone

what is your problem exactly. your iphone wont charge fully at what percentage it stop like 90 %.. it may possible that your battery one or two cell not working and that is why it want able to fully change. here is how to do ipad iphone troubleshooting. try to restore iphone to latest version of ios 11. remove your battery then clean connector point of your battery and then reinsert battery.
check your iphone with other battery and then check whether it fully charge or not. also
http://ipodtips-tricks.blogspot.com/2017/09/ipad-iphone-troubleshooting-guide.html

Hold the power button and home button down together for 10 seconds, or until you see a white apple.

Maybe the battery is bad

First check to make sure your charger is working, plug it up to the computer and see if the battery charging display comes up.

Second I would check to make sure the battery is actually charging.

Third try a cold boot, hold the power and home keys down while it boots it could just simply be locked up.

The only thing you can do with this issue is :

Hold the sleep /wake button and the home button at the same time for 2 full minutes

if you see a white apple appear- your good - just charge for 4 hours you should be fine

if the iphone still dose not turn on then - it need service

https://selfsolve.apple.com/GetWarranty.do

you can get the wire that connects your iphone to the computer or iphone to the wall. wait until its fully charged then try. take the battery out also and restart the phone

Hello ! I was in panic attack !!! did everthing and nothing seems to wake up my iphone. I forgot to charge it so battery went full empty, then I plug it on the wall charger, and nothing happend. I let it all nite, and next morning,... surprise !!!!! still the red icon, No battery, the iphone didnt restart!!!! How I fix it?
1-unplug it from the wall charger 2- press middle button and startup button, same time 3-when red battery dissapear, plug the charger. 4_ do this many times. Didnt work for me the first time, but at the end it works !!!!
NOW MY IPHONE IS WORKING GREAT !!!!! GOD BLESS YOU ALL !!!!!!!!

Put it in DFU Mode also hold the home button when its off and plug in the usb

check tthe back of the iphone is it hot if it is let it sit until it isnt then plug it in if that doesnt work put the phone into dfu mode (Hold the home button and plug in the usb cable into the fone