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I would'nt hazard a guess on your run times...too many variables, but as a general rule for batteries, the more AH, the better. Think of it the same way you would about fuel in your car. Would you rather have 2 liters or 7 liters? Which would get you further?
One thing to keep in mind with gel cells (and most other batteries, to a lesser extent) is that the discharge voltage/amps rate is not linear. The voltage will drop off after a fairly short period of time, which could be a disaster waiting to happen if your using the same battery for your radio equipment as well as the various motors Larger capacity batteries provide a much better margin of safety, and usually better performance overall.
Also the sealed lead acid batteries are not good at suppling high amps, and you amy find that your esc may be hogging amps from the Rx and and you may get glitches. Best use a separate battery for the radio or use NiMH batteries.
The BEC has to provide the servo's with 5 volts,
coming from the 12 volts you use.
The simple BECs simply discard the excess as heat.
(efficient BECs are switchers, but switchers are capable
of generating lots of RF noise, hampering reception...)
This means that with your 12 volts, you might be able to
drive LESS servo's from the BEC, compared by a 6 or 7.2 volt
system. check the specs of your BEC (often it is part of the
ESC) as you might risk thermal shutoff of the BEC, causing the
receiver to stop.
In short, in a high-voltage system, and a big model with room
to spare or in need of extra ballast, use a separate low voltage
battery driving the receiver and the servo's.
My (mini) servo's typically use half an amp each max., the
receiver typ. 100 mA.
In your case, a 2000 mAh (2 Ah) pack would give you one
hour minimum.
but choose the right type, i.e. one that does not drop it's
output voltage too soon.
I believe NiMH is good in that respect.
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