By James Stevens
Updated Mar 24, 2022
Extend the uptime of your battery‑powered device by switching to AC transformer power when an outlet is nearby. This step‑by‑step guide explains how to safely convert your device from battery to transformer power.
Locate the device’s input voltage label. Choosing a transformer that matches this voltage is essential to avoid damage. The label is usually on the device’s chassis or battery compartment.
Purchase a transformer that outputs the same voltage as your device. Variable‑output models allow use with multiple devices. Opt for one with screw‑terminal fittings for easy wiring.
Unclip the cover with your fingers or unscrew it with a screwdriver, then lift it off. This exposes the internal battery terminals.
Using a knife, cut a strip of dual‑core AWG 16 gauge wire to the length needed between the transformer and the device, allowing some movement.
Strip 3 inches of outer insulation from each end to reveal the two internal conductors. Strip ½ inch of the colored insulation on each conductor, ensuring you can identify the positive and negative leads.
Loosen the screws on the transformer’s terminals. Some are knurled and can be loosened by hand; others require a screwdriver.
Insert the colored wire corresponding to the transformer’s “+” or “Pos” terminal and tighten securely. Note the color for later connection to the device.
Insert the other colored wire into the “-” or “Neg” terminal and tighten. Verify both connections are snug.
Drill a small hole near a corner of the battery cover. The hole should be slightly larger than the dual‑core wire diameter.
Thread the wire through the hole and push enough through to reach the battery terminals.
Locate the positive and negative terminals inside the battery compartment. They are marked “+”/“Pos” and “-”/“Neg”.
Attach the positive wire (from the transformer) to the device’s positive terminal using tape for a secure hold. Repeat with the negative wire.
Replace the battery cover, secure it, and plug the transformer’s cord into the outlet. Adjust the transformer to the required voltage if it has variable settings, then switch it on. Your device will now run on AC power.
