Question: I would like Low Power Mode to be the default state of my device.

When I get to 80% battery it toggles itself off automatically.

How can I stop it turning itself off?

How can I always keep my phone in low power mode (or some other equivalent)?

Answer: 
With ios13, you can make an automation that turns on low power mode when your phone turns it off. 

![View screenshot](https://i.stack.imgur.com/XOpasl.png)
There is no way to achieve this functionality as it will always turn off at 80% as the purpose of it is to extend your phone when at low battery.

From [this Apple Support discussion:](https://discussions.apple.com/thread/7268548)

> 
> Low Power Mode reduces or turns off Email fetch, Hey Siri, Background
>  app refresh, Automatic downloads, Wi-Fi associations, and some visual
>  effects. If you can live without having those features available on
>  the phone, you can keep it on low power mode. But after you charge
>  your iPhone to 80% or higher, Low Power Mode automatically turns off,
>  so you'll have to turn it back on again.
> 
> 
>