Battery Combinations

[Synister]

I know the hurricane is supposed to be used with 2 3s 2100mah hooked up in series but lots of people seem to be having good luck running on 5s as well. My question is this; would there be a problem using a 2100 mah 3s and a 2s 4800mah? with the capacity difference being so large, what would likely be the problem? would the 3s just run outta juice a lot quicker, over discharge, and then im screwed? just trying to think how to get longer times using what ive got, without losing what ive got ;)

[txflyer]

i wouldnt try it, im pretty sure when using 2 different packs of any kind they need to be the same ma, and volts..

so a 2s and 3s pack wouldnt work...

[Synister]

Well see, thats the question i have. When 2 batteries are hooked in series, the voltage is added. So for a hurricane 550, 2x 3s1p(@11.1v each) 2200mah battereis in series now becomes a 6s1p (22.2 v) 2200mah. Therefore, if i were to hook up a 3s1p 4800mah and a 2s1p 4800 battery in series( same capacity, different voltages), i would have a 5s1p (18.5v) 4800mah battery. However, I am really wondering whats wrong with hooking up a 3s1p and a 2s1p with drastically different capacities (2100 for the 3s and 4800 for the 2s). Either way you slice it, using batteries in series is a lot less expensive than buying the single pack, even if you have to purchase higher capacity batteries to get decent times. Basically, i would like to get a z20a-1470 motor with an appropriate pinion and slap a 2100mah 3s 11.1v battery and a 4800mah 7.4v battery on it and fly away, however, something about this doesnt seem right, i just want someone to tell me what that is. Thanks again.

[phrank]

Your 2100mah is the weak point, it will discharge quicker than your 4800mah, possibly to the point of going below 3.3V per cell without you noticing until too late. ESC cut-off is assuming all cells are discharged evenly or close to it.