As a warning, don't use batteries that are too powerful for your gun. Depending on the spring you have in there, you should not go above certain voltages and amperages or you WILL kill your piston in a short time of full-auto use.
Amperage DOES make a difference in ROF - the higher the amperage, the larger the cell, the less internal resistance in the cell which results in higher ROF. Voltage makes a greater difference, but amperage does make a noticeable difference as well.
As an example, an 8.4v 2400mAh NiCd sub-c pack will kill a stock setup's piston in about 10,000 rounds if a lot of full auto is used.
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