Sweet.

I have a bunch of Turnigy 850mAh lipos I use for the Ketten. I get about 30 minutes of running them around before they drop to 6.8, so I'd imagine they'd run the Benny and DBC for a long time since there's no motor draw. The size is about half that of the receiver pack you have there, so they will fit in tight spaces. I'll back up your testing here this weekend.

I assume this is why the Tammy Tigers first came out (maybe still, I don't know) with two 7.2 packs needed, draw to weight. My M4 used to get a solid 25 minutes of of 1 1900, but the Tiger used 2 1500s for maybe 20 minutes or so.