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Increasing the mAh of the battery has a huge effect on the rate of fire. Period, can't argue the point. I run an 8.4V 140mAh battery in my spare MP5, has a 110SP spring in it, and it has a great rate of fire, maybe 800rpm or so. When I've used it with my main MP5's 8.4V 3300mAh battery, I swear the rate of fire goes up to 1000 to higher rounds per minute. Literally, it's a white line of BBs that comes out.
The more current available, the more the motor will draw for a certain load. Gears, spring, etc. will increase the load, but providing more current ability means the motor can work faster.
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