This would work

[straffham]

Be sure to check the battery you buy has a connector compatible with the one in the gun, failing that Component shop can make up connector leads in pretty much any combination.

[team flex]

http://www.componentshop.co.uk/7-4v-800mah-25c.html I am buying this battery now, but there are three options for connectors. Anyone know which one i should be choosing?

[dapprman]

It will be mini-tamaya

[TacMaster]

Mini Tamiya works with most guns however Deans connectors are better because there's more surface area on the connectors for current to pass through. A lot of guns don't come with deans however you can get them modded by someone who is proficient with a soldering iron.

[dapprman]

He's getting a G&G so it'll come as standard with mini-tamaya.

[team flex]

ok, thanks guys