I made a video to this effect several months ago to quell the naysayers on Arnie's Airsoft that a 7.2V wouldn't even turn over a stock gun. Not only did it work just fine, an 8.4V gave only 1 round per second extra speed over the 7.2V.
In fact, I use an Intellect 7.2V 4200 mAh pack in my M249 with a 400 fps spring, no other mods. I get probably close to 900 RPM on that battery. Going back down to a stock spring yields an even faster ROF that borders on wasteful.
The only 8.4V I own is an Intellect 1400 mAh mini for my MP5.
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Originally Posted by Scarecrow
P.S. Maybe someone in the know can answer this one, but my assumption was the voltage basically overcomes the friction of turning the motor and thus all the gears, and the tighter the setup, the more voltage is consumed in that push over friction. So if you have a good shim job, its easier on the motor and the battery and the battery will last longer. Bad shim job, more friction, shorter bat life. And in all this mah just dictates rate of fire... is this a correct characterization?
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That is correct though it's
amps you're consuming, not voltage. The more resistance you put on moving parts the harder the motor will have to turn, and thus draw more current. Bear in mind that current (amps) are not really something that is 'given' by the battery, it's something that is 'taken' by the device being powered. The harder a device has to work, the greater it's amp draw will be. If the battery cannot provide the requisite amount of current the device will not be functioning at it's full capacity. That's why the mAh rating is important, because not only will the battery have the capacity to power a high drain device but will also have a low internal resistance to provide those heavy currents.