I have a project where I need about 100 or so of a battery holder that will= enable 18650 cells to be rapidly replaced. The ideal unit will house two 18650 cells in series, or four AA cells as a = "plan B". Minimal length, diameter less than 3 inches. I need to be able to remove the flashlight head and add my electronics forw= ard of the batteries. Anyone know sources? -- David VanHorn Lead Hardware Engineer Backcountry Access, Inc. 2820 Wilderness Pl, Unit H Boulder, CO 80301 USA phone: 303-417-1345 x110 email: david.vanhorn@backcountryaccess.com --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .