I'm looking for a wall unit that I can screw in three or four DSE901 batteries at once. I've modified one unit so it plugs directly into an outlet and the battery stands on end with the LED at the top (upright). I'm looking for a unit that will do this with say four batteries at once. I'm very surprised I can't find one. I suppose I could use a powered USB hub and hot glue, but it seems to me this device should be out there somewhere.