This is an excellent device used for adding a larger battery to any AEG that only has a small battery compartment.  The sling will hold your larger battery and takes the weight away from the gun.  It is pre-wired so that you can plug directly into your factory battery plug.  Well worth the price.

 

Many players who use, SIG552, M733, M4A1, S-System, P90, etc... will use this battery sling and carry a much larger battery than what could have fit into their AEG. 

 

This battery sling 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).

 

Available in Black and OD Green.