What is this lock screen with ads and how do I remove it?

This lockscreen replacement is caused by an ad from DU Quick Charge

I am pretty sure that this lockscreen was added to the app "ES App Locker". Many User-Revievs are stating that this app comes with lots of unwanted ads and lockscreen-replacements.

See this review:

This is what they are answering to most people:

So you either have the option to turn this settings off apparently or remove this application.

You can check the user-reviews here: Google Play Story

Disabling DU Quick Charge may not work on devices. In this case insure that you completely remove the application. If the quick charge screen continues to display, check to see if you have any other apps that have this "adware" and remove them.

EDIT:

Based on the information seen in another question I wanted to update this answer. It seems like quite a handful of applications have added this lockscreen replacement in their latest updates. There is one Reddit discussion which mentions a few apps.

• ES App Locker and ES File Explorer Pro


• Xender


• Touchpal


• Amber Weather


• GO Weather Forecast & Widgets / (infact most Apps related to GO)


• Z Camera


• Kitty Play


• Locx


• Peel Remote

As @Andrew T. pointed out - the main cause of this lockscreen replacement is the advertisement of DU Quick Charge - developed by DU APPS STUDIO.

If you are experiencing similar problems then check this helpful answer by @Firelord to check which app might cause this.

_{I'll try to update this answer from time to time.}