I'll be curious to know if the charger is worth it at all. First, most people riding cross-country ride during the day. Unless you're planning to flash the Flea while riding, and recharge at rest stops, you won't need it much. Second, I doubt that tiny charger can charge even a tiny Flea battery in a reasonable time. Finally, I wonder where you'll park the light plus charger combination on your bike while riding.

Or should I have posted this in the 50+ (aka old fart's) forum?