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HomeAircraftHelicopterBeginners Corner › Witch would be betterBatt
06-17-2013 02:20 AM  5 years agoPost 1


Soddy Daisy, TN. USA

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I have a T-rex 600esp Ive been putting together,using a scorpion 4035 500 kv want to run 12s , would a battery 40c x 90 burst or 65c 130 burst, will weight be a prob... do i hook in series or parallel, i know it a simple question but need help thanks

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06-17-2013 02:49 AM  5 years agoPost 2

rrKey Veteran

Planet Brooklyn, NY-USA

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Run in series. Unless you're planning on stick banging and copter slamming then the lower rate will be fine.

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06-17-2013 02:50 AM  5 years agoPost 3



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to make 12S you will need to hook them in series.

what is your flying style?if you are not doing 3d 40C is plenty,especially with a 12S set up

looks like we were typing at the same time

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06-17-2013 03:04 AM  5 years agoPost 4


Soddy Daisy, TN. USA

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just getting into 3d...was worried about batt puffing

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06-17-2013 04:00 AM  5 years agoPost 5

rrElite Veteran

Greenwich, CT

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In series, 40C is plenty.

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06-17-2013 11:31 AM  5 years agoPost 6


San Jose, CA - USA

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What's the price difference between the 40C and 65C? I may be that when new both the 40C and 65C perform the same when only drawing 20C from them, but after 100 or so recharge cycles the 40C may be only 20C while the 65C might be 32.5C. Then the 65C might be better. The brand is also important as is the maximum charge rate. You may only need 20C, but a 20C battery may only handle a 1C charge rate, the 40C might handle a 3C charge rate and the 65C might handle 8C. 8C means you can recharge in 7.5 minutes. If your flight times are around 7 minutes you could use 3 batteries and two chargers to fly continously while at 3C you would recharge in 20 minutes which would mean you woud have to have 5 batteries and 4 chargers.

I haven't tried yet but ThunderPower claims that their G8 Pro Force 70C Series batteries can be charged at 12C.

I've been charging three of these batteries at 6C, 8C, and 10C. So far I have 45 charges on each of these batteries and I've seen no signs of loss of power or capacity. These batteries are also claimed to handle a discharge rate of 70C. I'm getting flight times over 5 minutes, so I'm using less than 12C average on the discharge side. I could use a much cheaper 15C battery and my heli should fly with no noticable difference acording to the specs, but the stock battery for this heli is 20C, and I can hear the difference in the speed of the rotor when I first start flying with a stock battery and one of the 70C batteries.

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06-17-2013 12:05 PM  5 years agoPost 7
Ronald Thomas


Gainesville, Fl, USA

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The higher the voltage, the less the C rating of the battery matters as the amperage demands decrease. With a 600 sized heli on 12s, a 40C pack will work well and not be hurt assuming you have large enough 12s 3300s-4000

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