RECOIL 500A Mobile Audio Battery Isolator & Starter Relay BRL500 — 500A Continuous, 700A Surge

RECOIL's BRL500 is a heavy-duty mobile audio battery isolator and starter relay designed to safely manage dual-battery systems, delivering 500A continuous current and up to 700A surge capacity.

When you run high-power audio gear or add an auxiliary battery to a vehicle, a robust isolator/relay keeps your starter battery protected while allowing the accessory battery to supply equipment. The RECOIL BRL500 combines a high-current relay with battery isolation features so accessories and starters get reliable power without cross-draining batteries or suffering voltage loss common with conventional diodes.

How does the BRL500 prevent one battery from draining another?

The BRL500 uses a high-current relay arrangement to separate battery banks electrically unless charging is present, so accessory loads cannot pull energy from your starter battery when the engine is off. Unlike simple diode isolators, it avoids a measurable voltage drop to the secondary battery, preserving available voltage for accessories.

• Separates main and auxiliary batteries when engine is not charging
• Prevents accessory equipment from discharging the starter battery
• No significant voltage loss to the second battery like diode isolators

What power ratings and surge handling does this relay offer?

Engineered for demanding mobile audio and starting applications, the BRL500 is rated for 500 amps continuous current with a 700 amp surge capability. This makes it suitable for high-current draws such as powerful amplifiers, winches, or heavy starter motors that need short bursts of extra current.

• 500A continuous current rating for sustained loads
• 700A surge rating to tolerate short high-current events
• Designed for frequent switching under heavy electrical demands

Is the BRL500 durable outdoors and in harsh conditions?

Yes — the BRL500 is built for mobile environments where moisture, vibration, and temperature swings occur. It offers excellent waterproof performance and rugged construction to maintain electrical reliability across weather conditions and rough service.

• Water-resistant housing for marine and off-road use
• Robust materials and mounting options for vibration resistance
• Corrosion-resistant terminals for long-term connections

How does installing the BRL500 extend battery life?

By keeping batteries isolated when appropriate and preventing unintended cross-drain, the BRL500 reduces deep discharges and stray loads that shorten battery lifespan. Maintaining proper charging and avoiding voltage drop also helps batteries reach and hold optimal charge levels more consistently.

• Prevents deep discharge of the starter battery from accessory loads
• Helps batteries remain at healthier charge states through proper isolation
• Reduces cycling and stress that accelerate wear on battery cells

Who is this for: The RECOIL BRL500 is intended for vehicle owners, mobile audio installers, marine enthusiasts, and off-road users who need a reliable way to manage dual-battery systems and high-current accessories. If you run powerful amplifiers, winches, auxiliary starters, or want to protect your main battery from accessory drains while keeping full charging efficiency, the BRL500 offers a compact, weather-resistant solution built for demanding current loads.