AA dummy and power injector battery

thingiverse

Single design enables the connection of an external power supply to AA battery-powered devices via a single AA-shaped power adapter. This requires some additional components: * 1x DIN 7985 M3 screw (for positive terminal); * 1x DIN 965 M5 screw (for negative terminal). Both screws should be 20mm or less in length, or 12mm for the negative and 15mm for the positive terminal on power injector models; * Approximately 8-10 cm of 22AWG wire (outer diameter with insulation should not exceed 1.8 mm); * Optional: heatshrink tube of suitable size. No soldering is required; simply strip the wire, loop it as shown in the pictures, and tighten the screws. For power injector models, run two wires through one of the three holes in the middle and connect each to its respective terminal. Since printer holes may be undersized, two model versions are provided: * V4: features screw holes at 5mm for M5 and 3mm for M3. Use this version if holes turn out too small. * V6 (smaller holes): has holes at 4.6mm for M5 and 2.7mm for M3. This version should only be used when printer-printed holes are accurate.