I recently spent two weeks biking through New England, trying to charge my iphone 4 w/ a Biologic Reecharge. I'd previously used it successfully in commuting and on century rides (where it easily kept the phone at 100% despite continuous tracking and displaying of maps).

My experience was not as good on the tour. The basic problem is that w/ the iphone 4, at least, the phone only wants to charge when the battery is full up AND when going about 12 mph or better. Less than this and the phone's battery actually drops more quickly than if the reecharge is not connected.

Now during this latest tour I did average 12 mph. However, there are lots of sharp, pointy hills in NE, especially in Connecticut, and I'd go for long times at speeds under the critical limits.

Bottom line: worked well for easy days, disastrous for hard days.

Another issue is that the "power out" button has to be manually turned on and off. It continues discharging the battery whenever the button is on, regardless of whether there is anything connected to it. So I had to remember to turn it off every time we'd go into a restaurant, for example. Otherwise, the next hour of good riding would just be for building up the battery charge again.

I think in the future I'll take a battery backup along.

pete