How to delete spam "battery under 25%" message

[AC Question]

For a few weeks now a message in a red box appears warning I'm under 25% battery. It is clearly some sort of spam. I wonder whether it is an option of one of the last apps I've downloaded, but I haven't been able to identify which. I'm not very sure where this comes from.
I have a Huawei P8, although I don't think this is relevant.
Please any help on how to delete it? I've heard spam removal apps actually make your phone worse, so I'd be reluctant to go that way.

 

[Javier P]

Re: How to delete spam "battery under 25%" message

Welcome to the forums. Could you post a screenshot with that pop-up? Do you have any cleaner or booster app installed in your phone? If so, disable it temporarily and see if the problem persists.

 

[JPard2]

Re: How to delete spam "battery under 25%" message

Welcome to the forums. Could you post a screenshot with that pop-up? Do you have any cleaner or booster app installed in your phone? If so, disable it temporarily and see if the problem persists.

Thanks! No app cleaner, no.
This is a screenshot: https://www.dropbox.com/s/y2nsmxc0f4ak7os/Screenshot_2016-09-28-14-41-50.png?dl=0

 

[Javier P]

You could try booting into safe mode. This process will temporarily disable all your third party apps and will tell you if the pop-up comes from the system or from an app that you downloaded.

 

[B. Diddy]

Welcome to Android Central! Are you sure it isn't part of Huawei's power management software?