There are 3.0 v and 3.6 v types. I think their cost is in the $15-20 range each. C cells and other sizes are also available
Check out http://www.saftbatteries.com/Produit_LO_G_cell_ranges_300_25/Language/en-US/Default.aspx
According to Pacific Tactical Solutions, when asked about the difference between the "P" and "C" their response was :
The T20C2 has a larger reflector/bezel for more throw and the P20 has a smaller head with a larger hot spot for a more usable light. The website lists under the battery specs ...
Put me down for 2 x SST-50-W65S, WJ-G4, 6500K, with GITD tail caps in HAIII Natural. Driver: 2.8A max 3 mode with memory.
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Let There be Light
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