Android - Battery Popup at 25%
This is caused by the Peel Remote app. I deleted this app and it stopped.
This looks to be a default setting popup which shows when your battery level reaches to a preset value of 25%. You can change these in Settings->Battery->BatterySaver option where you can either set the level to show the popup at 15% or 10% or you can turn it off by setting the
turn on automatically option to NEVER.