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Dual Battery Kits, Isolators & VSR Systems

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Set up your auxiliary power system with premium dual battery kits, smart isolators, and Voltage Sensitive Relays (VSR) from The Battery Cell. Engineered for absolute reliability across NZ, we provide DIY-friendly solutions and commercial-grade gear built to protect your electrical setup.

Dual Battery Kits, Isolators & VSR Systems

Take control of your auxiliary power. Whether you are rigging up a weekend 4WD escape, equipping an off-grid motorhome, or configuring a commercial marine vessel, The Battery Cell supplies the premium components required to seamlessly run secondary battery setups without risking your main starting battery.

High-Integrity Auxiliary Power Gear for the Kiwi DIYer & Professional

A dependable secondary power setup requires components that handle demanding charge loads automatically. Our main dual battery category splits into two highly specialized paths to fit your exact engineering requirements:

  • VSRs & Electronic Isolators: The ultimate hub for complete auxiliary kits, heavy-duty smart relays, and automatic isolating switches that manage dual-battery charging on the go.
  • 24VDC to 12VDC Voltage Reducers: High-efficiency step-down conversion units perfect for heavy commercial 24V trucks, farm tractors, and industrial boats that need to run 12V cycling, house, or auxiliary battery networks safely.

Every single electronic kit, relay, and voltage unit we sell is backed by our strict quality standard and our lifetime business promise: “The longer you get out of our batteries, the happier you are... and the happier we are.” We only source premium products that protect your expensive deep-cycle investments from over-discharging or system failures.

Ready to upgrade your secondary charging layout? Buy online for fast nationwide courier delivery across New Zealand, or pop into our Seaview showroom in Lower Hutt to grab your parts directly. Contact The Battery Cell team today for elite local advice on your next project.

YES -we are that same awesome Battery Supplier that used to be on The Esplanade!

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