Just buy Hyperion and you wont have to worry about anything. Just get the VX or EX versions. They are more expensive but well worth it. And they fit perfect in the ERBE batt. trays, no modding/hacking needed.

http://www.allerc.com/product_info.p...oducts_id=4797
http://www.allerc.com/product_info.p...oducts_id=5471

I personally use the EX version and they are absolutely awesome. I have never once pulled a pack out after a 15-20min race and had the pack above 110*F, and that was on a 91*F day. Oh and I charge @ 2.5c and the batts are at ambient temp after charge.

My racing buddy uses the VX version and they are awesome as well. The only reason I went for the EX was my LHS has them for only $5 more.

I have a brand new set of the Turnigy 2s 5000mah 40c, but I dont really want to hack my battery doors to make them fit.

Worry about winning, not your lipos.

Pete