4 Things to Know About Extension Cords for Battery Chargers

Thin or long extension cords slow down charging A cheap 16-gauge cord or one over 25 feet adds resistance and drops voltage, causing the charger to take longer or throttle itself.

Use 14-gauge for cords under 25 feet This gauge handles the current draw of most power tool chargers without significant voltage loss.

Use 12-gauge for 50-foot cords For longer runs, step up to 12-gauge to maintain enough voltage for fast charging.

Use 10-gauge for high-amp chargers or runs over 50 feet Chargers for large batteries, like lawn mower batteries, need thick 10-gauge wire. For longer distances, avoid extension cords entirely.