I have a couple of eboot Solar Chargers, whick look to be identical to the xsolar.
http://www.amazon.co.uk/gp/product/B00KMRYSQ8/ref=noref?ie=UTF8&psc=1&s=electronicsI've used them to charge an Olight R40 Flashlight directly, a Landrover A8 Andriod Smartphone and a eyeTV DVB-T Wifi server (allows me to watch Broadcast TV and Radio on the Smartphone)
The 1W Solar Panel will take quite a while to recharge the Lithium Battery. It should keep the Lithium battery topped up though if you charge the battery using an external USB power source.
Here is a Funkyprepper review.
https://www.youtube.com/watch?v=83DHX9D4CK4They also make ideal Secret Santa presents at work.