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1/ Nope, I installed a 100mm stock barrel in my MP5 (330mm vs. 229mm) and saw a 20fps increase. Adding one 20mm longer will net you nothing in any form.
2/ No idea about your guns, but 9.6V batteries usually beat the crap out of tappet plates (faster gear spin means greater impact on the tappet). An 8.4V 3600mAh will do you just fine, 9.6V really don't offer much performance increase without internal replacement increases. You'll get a higher rate of fire from both the voltage and amperage increases, but the rate of wear will also increase.
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