Fits perfect actually. Used a bit of high density foam to keep it from moving about, but apart from that is a perfect fit.
Got a small 8.6v as a backup, just incase.
Can really notice the difference in rate of fire between the two batteries. It came with an 8.4 so thought I had made a mistake by upping the voltage when buying my main battery.
You've said 9.4v and 8.6v. Just wondering where you got these from? Standard sizes are 7.2v, 8.4v, 9.6v, 10.8v and 12v for NiMH. LiPo's are 7.4v, 11.1v.