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Old 03-28-2011, 02:30 PM
RCFlyer44's Avatar
Join Date: Oct 2010
Location: Harrisburg, NC
Posts: 295
Question 3S or 4S Battery Question(s)

I am building this Great Planes Super Sportster EP and I purchased the recommended RimFire .25 42-40-1000 Brushless Outrunner Electric Motor and the Silver Series ESC 45A Brushless with 5V/2A BEC.

Both the ESC and Motor say anything from a 2S to 4S works great, and the plane recommends a 3S 3500mAh battery.

Haven't purchased the battery yet and I have plenty of 2200mAh batteries but I was wondering if I am correct in assuming if I use a 4S I would basically increase the RPMs by 3400 RPMs since I am increasing voltage by 3.4 volts and the motor has a 1000kV rating??

Also I know Volts X Amps = Watts and this motor is rated for 666watts according the manual but at 11.1 volts I am going to be right around 500 watts and they are getting their 666Watts using a 4S battery, obviously.

So any reason I should not just use a 4S battery vs. a 3S and what this the right formula for figuring the mAh rating if I do switch?

Also a 4S 2200 mAh battery seems to be a little cheaper (not enough to make a difference to me though) than a 3S 3500 mAh battery.

Or am I out in left field and done jumped the fence thinking this way???
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