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My MP5 started life as an A5, fitting an 8.4V 600mAh was tricky because you had to latch the rear of the handguard, then raise it up and pin it at the front. Then I installed an SD front end, found there was quite a bit (within reason) more room in there than the A5, and was much easier to install/remove the battery (especially with stashing wire, connectors and fuseholder). So, prefering the SD front end, you open up the size of batteries more (still going to be less than 2000mAh though.)
FYI, when my MP5 was stock, I'd get 1000-1100 rounds off on one 600mAh battery. When I upgraded with a 150% spring, the rate of fire and enduance went down a lot, would get about 400rds out before having to swap batteries. So a higher mAh battery will net you a higher rate of fire (motor isn't as limited to the amount of current it can draw), and will last longer.
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