The indicator lights from a WakaWaka Power+ should work as following:
The single light on top of the WWP+:
This light blinks when the WWP+ is charging via the solar panel. You can hold your WWP+ with its solar panel towards the sun or hold it under a strong lamp and check if the light is blinking.
The 4 lights on top of the WWP+:
These lights indicate the battery status. 4 Green LED’s = 100%, 3 green LED’s = 75%, 2 green LED’s = 50%, 1 green LED = (<)25%. If the battery status shows only one light, it could be that your WWP+ doesn’t have enough power to charge your phone. However you can still use the light perfectly!
The blue light next to the USB port (product code WP22):
This blue indicator light will light up when you charge a phone or another device via the USB port. Open up your WWP+ to see this light.
The blue light next to the USB port (s/n P02Axxxxxxx):
Warning! The blue light next to the USB port will light up when your Power+ is too warm or too cold or when the Power+ has reached the bottom of its own capacity. The Power+ will automatically stop charging either itself or an external device. If the temperature improves or the Power+ is recharged, the blue light will turn off automatically and you can use your Power+ normally. To see this light you need to position your device so that it is standing on the hinge.