Thanks, yes its that one pictured but in two tone :-( at present.
The battery is an 8.4v 2/3A 1100ma nimah nun chuck style split 3 and 4 cells. The connector is a square and a circle fitting. The 4 cell is 11.5cm and the 3 is 9cm long. Looks like 3-4 cm spare length wise on the 4 cell. Im thinking :
VP Racing Battery 7.4v 2000mAh 20C LiPo Crane Stock Battery from patrol base is the best option. battery wise, not necessarily stockist.
each of them 6 or 7 cells are 1.2v
each cell is aprox 18mm in diameter and 30mm in length
so in effect you have a stock battery of about 90mm x 18mm x 36mm (2x18mm)
the connector is called small or mini tamiya
(there is a large tamiya but mainly used for RC and jumbo airsoft guns)
The size is an aprox guess of your battery dimensions, depends what might lay best up front
usually the wires can just be tucked up on top of battery in handguard
As I explained YOU and you alone have to check before ordering up anything
it sounds daft but even with digital calipers nothing beats getting something similar size
and doing a final check that it fits in there ok - with a little room to spare
buy a battery that 1mm too big and you will be struggling or forcing it in which isn't wise
so have a look around on various sites/ebay for a nice size lipo
also consider getting 2 x batteries - one may do you ok especially if 2000mah
but depending on trigger happy or not - its a pi$$er running out of juice 3/4 way through ya day
(most just swap battery at lunchtime)
besides if ya paying for postage of 1 battery then may as well see if you can run to a spare
chargers - can get a B3 type charger for about £12 to £15
(little slower to charger but easy to use and just plug into mains - no psu required for most of them)
or a B6 genuine for about £20 from hobbyking
nearly all B6's on fleabay will be fakes - often they aren't too bad but clones can over charge - not good
read up on lipo common safety sense - they are very powerful
so ffs don't be a dumbass and go and puncture them like some ar$ehole did (moi btw)