the battery is 4 cells wide and 2 cells long, right? If so, I use one in mine.
I did have to do some mods to make it fit through... want a picture? :-D
Also modded it to be 8.4v instead of 9.6v and bought a new connecter for it... haven't got the connecter yet though, just taping the wires in, the connecter sizes are different.
What I did was cut out the one cell, stuck some wire in there to connect the two cells that were then not connected.
Then, i cut it down the middle and shaped it into a V then taped it up, first replacing the connecter that was not too short with some copper wire.
Then, I found the connecter does not fit, so I cut it off and am now just sticking the wires in.
Make sure to get everything in place... haha, works great now, but my first game... ended up using a Crosman springer. :shock: