I am no expert on battery types but the Hecells are supposed to be able to take the higher discharge rates we might demand of the bigger prop/more power/more speed that i wanted out of the electrajet with the Mega 16/15/8 brushless motor. My packs are the 2/3A cells and I purchased them from www.Edogflight.com. I am sure there are other places to buy these cells but i have received good service so far from these folks. Bought some ten cell sticks and the performance was even better than the eights but at the expense of 1-1/2 to 2 minites less run time. max time is now 5 to to 6 mins. There is also a large difference in the vertical performance when going from the APC 8 x 6 to the APC 9 x 6.
the plane will climb out at a very good angle of attack and can gain several hundred feet of altitude in just a few seconds. The APC 9 x 7.5 is a bit faster and seems to climb even better but endurance really suffers as the performance goes away after just 3 mins of run time and while the motor and controller feel nice and cool the pack itself is warmer than when running the 9x6
With the 8 cell packs the 8x6 gives the best all around performance and the 9x6 with the ten cell is an even perkier combo.

take care
z-123