Originally Posted by Harry2

Energy Trends
ET - Energy Trends - Solar Energie Produkte
Sorry, their site is only in German.

But you can compare the specs
Note the the electrical power output of the solar panels.
Rough calculation:
That e.g. 0.4W power you have to divide with 5V output voltage ...
that is about 0.08A = 80mA charging current for the battery.

Harry