Originally Posted by Barak1001
The issue with using a 4s is weight, generally they are much heavier than a 3s that will fly as long.
This means that with a 4s you'll wind up having to add weight to the tail (literally weights of some type) in order to correct the center of gravity for the helicopter.
3s 2650 mah are about the largest batteries you're going to want to use on your helicopter. With a 212 gram battery (weight of the 2650) you'll wind up having to be extremely creative with mounting your electronics to get it to balance.
With the Flightmax 3s 2200mah 25c that most people use they are the perfect weight to balance the chopper out.
My RCModelpart 2800 mAh 3S are a lot lighter than that .. in fact lighter than my 2280 mAh 3S GE pack ....
2800 pack :
2280 pack :
I'm actually thinking to go even bigger on capacity if I can get it under 200gr.
Oh the pair of 2800's I bought of Ebay came to about $20 incl shipping.