Choosing a battery...

[BrianG]

My "racing" revo has a limited space for batteries so I'm looking for a pack that will deliver 16v (or more) and fit in a space of the following dimensions:

Width: 2" (50mm)
Height: 1.5" (38mm)
Length: 5.5" (140mm)

I was planning on using Emoli cells (which would fit), but might just try Lipos (against my better judgement) for weight reasons. However, I can't find Lipos that will work. I'm using a fairly light (10lb) Revo with a 10XL motor with a final gear ratio of 16, and am looking for something around 4-6Ah. So I figure a steady current rating of 80A should suffice, but can't find anything that will work. Any ideas?