vedantK's blog - RC Groups
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Posted by vedantK | Mar 02, 2018 @ 12:12 AM | 4,725 Views
Well I am just try to build my own quadcopter and I have just started this month. I have a question regarding the battery to select.
Here are the components I have bought:

4X Racerstar Racing Edition 2205 BR2205 2300KV.
4X Racerstar RS30A 30A Blheli_S.
Gemfan Windancer 5042 5x4.2 Inch PC 3-Blade Propeller

The plan is to place a single microprocessor on my quad which I can control using my laptop. I am able to complete the calibration and turn on the motors.

However, the problem I am facing is like when I increase the pwm from 1000 in steps of 200 the motors begin the slow down. For example, after calibration if I change the throttle to 2000 then the quad does lifts off for some height but then the motors slow down.

I dont think there's a problem with the esc as a single motor just works fine with all configured speeds, but this only occurs when I power all the 4 motors.

I do doubt the battery as I had bought it hastily without investigating. It's a cheap 18650 Li-Ion battery pack 12V (3S) battery set which I think is not able to source so the required current. ??

Then I checked my motors and I guess racerstar consumes about 26Amps max current which would mean 26 x 4 = 104 A.
So by that calculation, I guess I would require a battery which can provide about 100A ?
I am thinking of buying a 2200 mAH 3S 40C/80C LiPo battery pack which can provide only about 22 x 4 = 88 A.
Now I am confused if I can operate the motors at max throttle?

Also how does the rating 40C/80C actually work? When does 80C come into picture as that would provide a current double of what it will provide at 40C.
Is it like a short burst of current at full throttle after which it will go down to 40C again ??