Iphone6splus battery is very hot and consumes a lot of power. What happened?

Hello, one of the most common reasons for power consumption is that too much software is installed, which takes up too much mobile phone memory, making the available running memory of newly installed software decrease, and the running is stuck and not smooth. Power consumption is fast, there are too many self-starting software, and the software runs secretly in the background, occupying too much running memory, and the mobile phone wastes a lot of electricity when it runs for a while.