I have 2 Trakpower 4900 bricks in my B4 and 2 Core RC 3250 lipo slim packs for my Durga. The Core packs only weigh 200g compared to the 260g of the Trakpower (weighed on our kitchen scales) and will do 2 heats and a practice session running a 5.5 brushless.
The ace thing about them is the case has moulded lugs on one side so they will fit into the cell trays on a TC chassis if you want to run one of those as well as a buggy.
I also know a few people have had Trakpowers swell up and the one I saw frightened the crap out of me. I haven't personally had a problem with them but I also always charge with the Trakpower V-balancer in line with my charger so maybe that prevents swelling.
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