I have a Mega-Power 1350 15c 3s pack that's a little swollen. It's 25.4mm (1.00") thick, 35.5mm tall (1.40"), and 76.2mm long (3.00"). It JUST barely fits in the front, there's a insulator of DS sticky foam tape & FG between motor & Lipo, about 3mm thick (1/8"). The canopy can be a PITA to put on, depending upon where the balance charger plug is at the front of the canopy up/down,etc.

Rick