Hi I am using my Desire as GPS system on my mountain bike. To prevent battery problems, I was looking around for an external battery when I found this: Solar EnerPack - Solar EnerPack Charger / Solar Charger Specs seem to be OK, I just need to replace the US power plug with a European one. Anyone out there who has experience with this product (or company)? Is it any good? Is there a European supplier, or maybe someone has an alternative option? regards and thanx in advance D.