hello all, new to electric flight,

-one plane(parkzone corsair) requires an 1800 mah, 3S, 15C, 11.1v battery. it has a 30A esc.

-second plane(Extra300 Airfoilz) requires a 1500 mah, 3S, 20C/peak discharge 30C 10 seconds, 11.1v battery. it has 35A esc.

...........sooooooo i havent bought more than 1 battery each because i am confused.
Q: are the milliamps the "gas tank"? more mAH and longer flight time?

Q: ok now, can i put a 20C battery in a 30A esc? or does it have to be 15C?

Q: can i use a 2100mAH, 20C, 3S in both of these planes, if not what do i need to do to maKE that happen?

*basically trying to buy a couple planes that i can use the same type of battery on for simplicity.
HELP! ANYONE?

-WINGMANEPTX-
KEVIN

Yes, the capacity of the battery is an indicator of the amount of available energy to do work. More capacity equals more work.

Absolutely. The C-rating is just an indication of how much current the battery can provide. For instance a 2000mAh (2Ah), 10C battery can provide 20,000mA or 20A of current. That doesn't mean you have to pull that kind of current out though; it will be just as happy or happier providing 5A. It is the motor/prop/plane combination that determine that.

Yes, provided it will physically fit into the airplane. Should be no problem in the Corsair. I'm not familiar with the other plane though so I can't really say for sure.

The main reason that the Corsair comes with a 15C battery is twofold: first, it doesn't really need it anything more and second, it keeps the cost of the airplane package down. You can run a 20C, 30C or whatever you want in it though. In fact, I'd never purchase batteries under 20C since the prices are so good now.

You want your battery to be able to provide more amps than the ESC can pull (ideally) So if the speed controller is 30amp and the battery can deliver 35 or 40 your fine because you cant hurt a battery by pullling less than its capacity but you can almost garantee problems by trying to pull 50 amps out of a battery designed to provide 40


Capacity * C /1000 = amps

2200 mah * 25C = 55000 mah /1000 = 55amps Hooked up to a 35 or 40amp esc this would be perfectly happy.

oh man you guys are awsome!!!!! thank you soooooo much!!!!
.
.
.one more question....does anyone know of a chart that gives the "C" Rating conversion...ie, 15C = 27 amps. ?
or can anyone gimme a quick rate?
15, 20, 25, 30 ?

thanks in advance!
-kevin

One correction. The "C" rating is not what the battery can supply, that's the capacity or the mah level of that battery. The C rating is the maximum current in burst form, that that battery should be subjected to. 20C means 20 times the capacity. If it's a 1000 mah battery, which is 1 amp-hour, by the way, this battery, being 20C can put out a 20 amp burst, 20C. Note that of course, because this is 20 amps, and the capacity is 1 amp per hour, well, that battery will last 1/20th of one hour (as compared to 1 amp per hour till depleted), so the "gas tank" will drain much faster.

The amount of burn available is totally dependent on usage. If you have a 20 amp ESC and fly at, sa 10 amps (take off and fly orbits or something that is not demanding), you will get about 1/10 hour of flight time or about 6 minutes maximum. This is, of course, under ideal conditions. If you have a 2000 mah 10C battery (note.. 2 amps times 10C = 20 amps burst), well, you might get 20 minutes.

A lot of other factors come into play, of course because the receiver and servos consume power, and there is a waste factor in the form of heat that reduces the efficiency. Remember, all the power from electric flight comes from one source, that's the battery. As in fuel, or glow powered, there is a lot of wasted efficiency due to heat, friction, and so on, and the same is true for electric, except there is only a limited amount of power and it all comes from the battery pack.

One safety issue that I always pass on.. please... charge your batteries outdoors, not in your home, or in your car/van/truck.. do it in the open away from structures. Thsee batteries can be dangerous if they overheat... like a slow exploding stick of dymamite!!! (exaggeration.. but you get the idea, I'm sure) Be careful!!

CGr