I finally caved and bought a Garmin Forerunner 405 (more on that later). Its form factor is nice and small, but it only carries a day worth of GPS power. On a long trip, I would need a way to recharge it in the field.

Enter the Minty Boost. The Internet is fortunately fully of smart EEE majors who have a fetish for building stuff in Altoids tins. The Minty Boost is one of such creations. It allows a USB device to be charged from a couple of AA batteries.

The DIY kit is available from Adafruit for $19.50.

I might just get one, and whip out the old soldering iron and see what I can assemble in a half hour.

I'll post my results of how well it charges the Forerunner once I know more 🙂