Lipo 20C vs 40C, only 0.1 min hovering difference

I want to buy some new Lipo for my Arducopter. The existing I am using is 3S 2200 20C.
I was thinking to go to 3S 2200 40C.
But using eCalc (see below), I did notice the hovering time for a quad is increased with only 0.1 min.
I am interested for hovering in principal (for aerial pictures) and not acrobatic.
Is worth to go with 40C (more expensive) or should I continue with new 20C?

I am well content with 2 x 3S 2200 20C in parallel, this is really a big difference.

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  • It's also widely recognized that the C ratings for batteries are grossly inflated and should not be taken literally.

    It's mostly useful as a comparison of two different batteries from the same vendor.  Higher C rating has lower internal resistance, and might cost more, weigh more, have heavier wire gauge, or be better matched.    Beyond that, I wouldn't assign any actual units.  (I don't think they can actually run at max C discharge without damage.)

  • OK, thanks for all reply. I had under impression that C factor could increase the time, but I was wrong.

    My battery is warm (normal) after 7-8 min of flying at 25 deg C, but never hot.

    I will stay on 20C and for longer time I put 2 in parallel, or I will go for a higher MAh.

    So eCalc was correct.

  • Your 2200 3s 20C have a max continuous discharge of 44amp. Are your batteries hot after flight?
    My copter hovers @ 17-24amp depending on weight. Flying aggressively, hard turns @ full throttle, rarely spikes above 35-40amp. So my max burst current draw is only 2/3 of the lipo's max continuous rating.
    The closer your draw is to your C rating, the harder your lipos have to work. A V8(High C) motor is overkill if you're grocery shopping. But a V6(Low C) has to work so much harder when towing a trailer, or racing on the track. The lipos get hot fast.
    Sounds to me that you're looking for a daily commuter.(AP) If a 2200 20C keeps you in the air, isn't too hot after flight, and performs to your satisfaction, a 44amp discharge is more than enough. However if they are getting hot, a higher C would help.
    If you want longer flight times, you need bigger/more(parallel) batteries.
  • The C number is about the max. load and not about capacity.
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