With a solar you never know how much it will charge, you need to put it exposed to the sun and therefor exposed to the weather and possible dishonest people.
Both the Xsolar and the WakaWaka Power+ have batteries onboard; the solar capability is used to recharge the battery.
Yes I know that. I mean if you run the solar charger battery down, you are not sure when you enough power in the battery again to fully charge your phone again. Changing wheather or if you are unable to put the charger in a sunny place consistantly, will make the availible power after draining the solarcharger battery once a big mistery.
If the battery in the solarcharger is enough for your expected use, then you don't need the solar part.
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