This daydream shows you the charge of your battery in every color you want. Only for Android 4.2 and up.

Functions:
- Solid color: any color you want! (Defaults to Zwerversblauw)
- Voltage dependent colors: max 30 colors (default: 0-14% = red, 15-29% = yellow, 30-100% = green)
- Random colors
- You can change the battery size
- Several types of animations
- Option for automatic brightness control with the builtin lightsensor (when available)
- Dimmed screen mode
- Percentage and/or time indicator

How to setup
To activate goto Settings->Display->Daydreams and select Battery.
Set "when to daydream" to "during charging" and it will be activated automatically.
*note that Androids preview of Daydreams may fail. Try tapping the button again. The app also has a built-in preview.