While waiting for my BL motor to come back I tried the new 7 cell packs and still got 11 mph (380 motor), the same as with the 6 cells. That's one thing though about the radar gun, it does not show tenths so with the 6 cell it might have been 11.1 and the 7 cell 11.9? Pretty hard to see that. I'll make this rr go 15 mph yet...lol