Why Is My Battery Dying So Fast Iphone 6s. Keeping your iPhones screen at full brightness is a likely culprit when your iPhone battery drains fast but its easily remedied. Sometimes it could damage your CPU after being exposed to extreme heat.
There are different reasons why your iPhone gets hot and drains battery fast. I had similar battery issues my iPhone 6 would shut down randomly and the battery would drain quickly after a full charge. I would consider replacing the battery.
There is less space for the bat.
Open the Control Center by swiping down from the top-right corner of the screen. This is usually the case most times. So after replacing the battery I still noticed that the battery would drain pretty quickly while using it. Make sure your iPhone is connected to a stable Internet connection.
