These work well also. Never had a sbm or d100 fall below 4 bars after 3.5 hours with it.
http://www.nimhbattery.com/maha-powerbank.htm
Stats: 1800mAh NiMH Typical ( Averages 1900 to 2000 mAh), 6V, 500mA
So I checked this thing out, pretty neat! What caught my eye:
"MH-DPB180-SD Nickel Metal Hydride Version - STEP DOWN VERSION"
- this thing is apparently a cable designed for cameras requiring between 5V and 6V to help regulate the 6V output it's giving.
*SO* I wonder if I could use this thing to externally power a JB3?!? How cool would that be! Any thoughts from JB3'ers out there? Doesn't it require something between 5 and 6V's? It's almost cheaper then the extra spare battery I just bought was as those extra batteries are becoming *scarce*.