This is an excellent device used for adding a larger battery to any AEG that only has a small battery compartment.  The bag will hold your larger battery snug in place.  Most players attach them to the stock of the gun.  It is pre-wired so that you can plug directly into your factory battery plug.

 

Many players who use, MP5, SIG552, M733, M4A1, S-System, P90, etc... will use this battery bag and carry a much larger battery than what could have fit into their AEG.  This battery bag comes with a large plug, so if your AEG uses a small plug, you will need to pick up a battery adaptor as well (sold seperately).

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