The stock 7.4v battery should get you atleast 6-700 BBs out. Well atleast thats what I have managed to achieve, I guess everyone elses experince varies. There is an external battery mod out there that does allow you to have a larger battery, but so much more power would simply be more ware on the mechbox.
The most simple cost effective method is to simply purchase another AEP battery, they are fairly inexpensive.
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