I'm not exactly sure of the weight, but my best guess is maybe a pound and a half?? I can hold it between my thumb and index finger without much effort and I really don't notice the weight of it at all when riding. I got it at http://www.batteryspace.com for $31, and to not kill it by overcharging with a cheap charger, I also got a smart charger from the same place for $35. I'm really happy with it so far, and it recharges in about 3 hours. EDIT: Looks like the battery price is now $32.95. And they list it as 2.2 pounds, but it feels lighter to me. It is here: http://www.batteryspace.com/index.as...ROD&ProdID=432

Becca - thanks!

Map Tester - you have keen eyes. Yes that is a piece of redwood 2x4 that I cut down and hollowed out. I kind of like my homemade projects to have a "Clampett" aspect to them and that fit the bill. :-)
Actually a metal box probably would have been better but I didn't have anything onhand to tweak so opted for the redwood. To hollow it out I started by drilling several 1" holes, then used hand chisels the rest of the way. I don't have a regular woodshop so had to improvise. That's ok - I like improvisation. :-)

The back part of the 2x4 is open so the wires can connect inside there, then I used a spare computer drive bay cover I had laying around to make the cover that also holds the two switches. I cut it down a little to fit, then just painted everything black.