Was thinking of getting one of those Amzer charging cradles with the extra battery slot ... it's SO cheap that I'm nervous that it won't work. This one
Amzer Desktop Cradle with Extra Battery Charging Slot For Motorola - Motorola Droid A855 - Fommy.com says "extra battery compartment won't charge unless plugged in directly to the outlet due to the low power generated by the USB output."
I have a car charger that a usb cable fits into and it charges the droid pretty well ... i was hoping i could take a charging cradle with us on our upcoming camping trip and charge the extra battery via the van while I'm using my Droid. Not sure if this would work.