Its been talking about quite a bit over on the Motionbased forum and if you REALLY search Energizer's site, you can find it but its really buried deep. Someone did email Energizer product support, however and was told that apparently the voltage ramps up and down and that's how it charges the phones.
I seem to recall someone on the MB forums particularly mentioning damaging their unit with one of those but I could be mistaken.
Personally, I built a Mintyboost for myself. The above mentioned charger looks pretty cool too and I was actually thinking about building one of those that could be attached on the bike by a velcro strap or something.
Check this thread out for info on chargers.
http://forums.motionbased.com/smf/in...p?topic=5519.0