Collection: Auto - Auxiliary Battery Kit

Power your accessories without draining your starter with our premium selection of auto auxiliary battery kits. Whether you need a complete dual battery system for overlanding, heavy-duty battery isolators for your RV, or vehicle-specific mounting trays and wiring harnesses, DIY Customs offers top-tier electrical solutions at unbeatable prices. Perfect for running winches, fridges, and high-output lighting on the trail. Don't see the exact solenoid, cable gauge, or brand you need for your power setup? Hit the live chat or call 412-882-8346—we can special order and drop-ship exactly what you are looking for directly to your garage or doorstep!