Made my own auxiliary battery pouch to attach to my holster.
To accomodate my 9550 AND AN EXTRA BATTERY, after considerable planning, I went to Hobby Lobby, bought some black leather, some upholstery black thread and some velcro. I constructed a pouch by sewing and then attached it with stitches to the perimeter of my BB holster. All of this was to provide a pouch to hold my extra battery so I can have all I need in the most hyper-efficient carrying unit possible. I think the professionals could do this if I can.