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Step 2Load 'em up.
1. Slide the first battery into the tube positive terminal first. (pic 1). It can be a bit of pain to get them to slide into the tube and a permanent maker can be used to ram them down if needed.
2. Slide the second cell in negative terminal first. You want the cells to be negative to negative. If you're using cells that have a base rim that keep the terminals from touching in this position (like the SF123A's, see pic. 2) then you won't need any kind of insulator. If you packing AA's or any other cell type that will touch terminals when configured like this, cut a small square of inner tube (smaller than the diameter of the cell, but big enough to cover the majority of the contact, see pic. 3) and place it down in the tube on top of the first cells negative terminal so that they are insulated from each other. (pic. 4)
3. Align them so that there is about 3/4" (2cm) of tubing sticking out on either end. (pic 5.)
2. Slide the second cell in negative terminal first. You want the cells to be negative to negative. If you're using cells that have a base rim that keep the terminals from touching in this position (like the SF123A's, see pic. 2) then you won't need any kind of insulator. If you packing AA's or any other cell type that will touch terminals when configured like this, cut a small square of inner tube (smaller than the diameter of the cell, but big enough to cover the majority of the contact, see pic. 3) and place it down in the tube on top of the first cells negative terminal so that they are insulated from each other. (pic. 4)
3. Align them so that there is about 3/4" (2cm) of tubing sticking out on either end. (pic 5.)
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