Mercury 10m solar charger compatibility issue?

I recently received a Mercury 10M solar charger with USB compatibility that it says to work on Idevices and android. When i placed it in direct sunlight and plug it into my iphone 5s running ios 7, it says accessory may not be compatible. How to fix this? I need help.

An iPhone is a device which uses a a USB charger. There's no question of an incompatibility. If the Mercury charger does not charge your phone through the USB outlet then ask for your money back.

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