Dummy for AA or 14500 cell

Dummy for AA or 14500 cell. Can use 45mm M4 bolt with 1 mm thick washers or smaller bolts and washers with a wire (or use a pen spring) if desired to allow current to pass through. I designed this to allow me to use 14500 rechargeable batteries and a dummy AA cell instead of 2 AA cells. I already have the 14500 charger and plenty of 14500 batteries, so this allows me to use rechargeable batteries in place of AA.

Note that the 14500 is 3.7 volts but when fully charged is 4.2 volts, so only use this substitution when exact voltage isn't important. Most DC motors and flashlights can use this substitution.