I am by far not an expert on the subject, but I feel the following insights that I've discovered may help you.
A nunchuck battery should fit in the foregrips of an m4. As far as voltage is concerned, the extra voltage on the 9.6 will give your m4 a little more "snap" resulting in an increased RoF. The downside to this of course is that extra snap is additional strain on the internals of your weapon. If you plan on using the 9.6v battery, plan on upgrading plastic gears and bushing to metal ones at the same time and you should be fine.
Totally as a side note, unless you're the kind of person who likes to spray and pray, the increased RoF isn't a big selling feature. The fact is, you can play approximatly 2.5-3x longer with the nunchuck battery, which will make alot of difference in the field. If your main field is an indoor arena like XT here in Winnipeg, having a mini battery should be fine. Not only are indoor games shorter, but even if it does die in the fight, its only a couple steps away to a charging area.
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