Just swapping to a pack on stock motors/wheels/cage will max out at 130 FPS, and IIRC it wont hit much harder than 100-110 without new wheels and new motors.
Current is demanded by the motors, you cant supply more than theyll ask for. Meanwhile, supplying *less* than they want is bad for your batteries, and doing bad things to some kinds of batteries is what leads to fire and explosion.
You might consider swapping for a dartzone or adventure force fly wheeler, those hit 80-100 OOTB with AAs. The AF double trouble is $20 and theres a file on thingiverse to make it side-mag fed.
Ed: RE Voltage: if the setup is designed for 7.4ish, supplying 7.4ish shouldnt hurt things. Voltage *is* pushed from the pack to the motors, and upping it can burn stuff out. That said, I use a 20v pack on my nominally-3s motor builds and it hasnt caused immediate problems.
This. So no worries about using that Sub-C 6 cell R/C style battery pack.
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