Isolator Kits

If you’re running multiple batteries in a modern vehicle—especially for car audio builds, show cars, or accessory-heavy setups—an isolator kit isn’t just helpful, it’s essential.

An XS Power isolator kit allows you to safely run a secondary battery (or bank) alongside your main starting battery without risking your vehicle’s ability to start. In car show environments, it’s common to power lighting, audio systems, and accessories for extended periods with the engine off. Without an isolator, both batteries drain together—meaning you could end up with a dead starting battery when it’s time to leave.

Why an isolator kit matters for car audio & show vehicles

• Protects your starting battery: Keeps your primary battery reserved strictly for starting the vehicle, while your secondary battery handles accessories and audio loads
• Prevents full system drain: Ensures that when you’re demoing your system or running lights at a show, you’re not pulling power from your crank source
• Automatic operation: Our isolator kits intelligently connect batteries when charging (engine running) and separate them when the vehicle is off

LFP / LiFePO4 Lithium + AGM? You need isolation

Mixing battery chemistries—like lithium (LiFePO4) and AGM—without proper isolation can cause serious issues:

• Different resting voltages lead to uneven charging and discharging
• Charging profiles don’t match, which can stress the AGM or confuse lithium BMS systems
• Current backflow risks can reduce efficiency and potentially damage components

An isolator kit prevents these problems by keeping each battery type in its proper operating lane while still allowing both to charge from your alternator when needed.

Why jump starting your AGM isn’t a long-term solution

If you regularly drain your main AGM battery and rely on jump starting, you’re shortening its lifespan—fast.

• Deep discharges damage AGM plates, reducing capacity over time
• Repeated jump starts create heat and stress, accelerating wear
• Voltage spikes from jump events can harm sensitive electronics

Instead of abusing your starting battery, an isolator kit paired with a dedicated secondary battery ensures your system has the power it needs—without compromising reliability.

The bottom line

An XS Power isolator kit is one of the smartest upgrades for any dual-battery setup. Whether you’re at a car show, running high-power audio, or just want peace of mind, isolating your batteries protects your investment, improves performance, and ensures your vehicle starts every time.