After reading Stan's post re the 3.2V 40Ah battery I saw this. It should run a 10 watt rig for nearly 20 hours. The appropriate charger is an additional ~$20.
http://www.all-battery.com/Li-Ion1865011.1V17.6mAhBatteryPackwithPCB-31194.aspx
Ben
Just as an FYI, Li-Ion packs are available from China on ebay in similar capacities for a fraction of the cost...like the $40/$50 range. I've never purchased a set, but from feedback, delivery seems to be reliable and product seems to be good. Just saying for people that might find this product to be price prohibitive.
Tone...I'm striking out on my eBay search for the +100WH Li-Po or Li-Ion Batteries...Challenged I guess....Could you link one?
Oops sorry, I was a little bit off in my earlier response. The battery I was thinking of is actually $80...still a third of the price of those linked above...these are Li-ions not Lipo's.
12V, 9.8ah for $50
http://www.ebay.com/itm/New-12V-Portable-9800mAh-Li-ion-Super-Rechargeable-Battery-Pack-/220857050716?pt=US_Batteries&hash=item336c1b265c
12v, 18ah for $80
http://www.ebay.com/itm/DC-12V-Portable-18000mAh-Li-ion-Super-Rechargeable-Battery-Pack-/150663276338?pt=US_Batteries&hash=item23143b2732
There are lots of similar listings for these. I don't see any high capacity lipo's listed though, so not sure if you were set on lipo's vs. li-ions, but yeah these seem like they'd be a good option.
I've seen a few lipo/li-ion mega-bargains myself (admittedly none as tempting the 12v/18Ah one) but I have some kind of inbuilt fear of anonymous ebay high capacity cells, so I always revert to big suppliers that give the impression of "Our batteries won't burn your house down!"