Hey folks, apologies if I'm posting in the wrong sub-forum.

I bought an iPhone 5s recently to use as a temp phone. I am having terrible battery drain when using it, to the point where it will barely last me 6 hours usage. I've had the battery changed as soon as I had it, but the fault is still occurring.

Also, the phone does get really hot while charging, especially the top half and I am using an official Apple Lightning Charger and plug.

Current phone specs:
Lowest brightness setting
Location Services - Off
Wifi - Off
Bluetooth - Off
iCloud - Off
Network Settings - 3G Only

Hopefully one of you guys can help me out, maybe shed some light what is happening.