ok, so I'm flying a Bixler 2 FPV plane, I'm running a 4s 40c 2650mah pack and it has so much power with the motor im using the thing would probably rip itself apart if i gave it full power punch, so ive came to the conclusion that 3s is plenty for this plane, but i am kinda in the dark on batteries. I was thinking i could use two 3s 30c 2200mah, one of these packs has an amp draw of 66 amps constant, this might be sufficient, but I dont want the packs to get hot, so if two are connected in parallel would this be right: 3s 30c 4400mah???

or would the "C" change to 60 as well?

like i said, I dont all the power the 4s gives me, i can literally cruise at around 45mph at not even a quarter stick, so 3s would be perfect. I figure if im remove the extra weight of a 4s, i could just go for less power and more flight time.

Originally Posted by brian.blackshear

ok, so I'm flying a Bixler 2 FPV plane, I'm running a 4s 40c 2650mah pack and it has so much power with the motor im using the thing would probably rip itself apart if i gave it full power punch, so ive came to the conclusion that 3s is plenty for this plane, but i am kinda in the dark on batteries. I was thinking i could use two 3s 30c 2200mah, one of these packs has an amp draw of 66 amps constant, this might be sufficient, but I dont want the packs to get hot, so if two are connected in parallel would this be right: 3s 30c 4400mah???

or would the "C" change to 60 as well?

like i said, I dont all the power the 4s gives me, i can literally cruise at around 45mph at not even a quarter stick, so 3s would be perfect. I figure if im remove the extra weight of a 4s, i could just go for less power and more flight time.

3S 30c 2200mah => theoretically 66amps max

3s 30c 4400mah => theoretically 132 amps max

You'd probably fry the batteries at 100amp though

Two 30C 2200mAh packs in parallel would give you a 3S 4400mAh pack with the 30C rating staying the same.
It sure sounds as though your setup was way over amped on 4S, do you have a Wattmeter?
If you have a 3S pack in the 2200mAh range, give it a quick test with a short flight and see what the current draw is with a Wattmeter before going with the dual packs in parallel.
Pete

Thank you both for the quick reply, both answered my question completely. Ill have to go out this evening for some testing when the wind dies off.

and no, i dont have a watt meter, ill have to look into one soon.
thanks for the advice