{"product_id":"recoil-500a-mobile-audio-battery-isolator-starter-relay-waterproof-700a-surge-capacity","title":"RECOIL 500A Mobile Audio Battery Isolator \u0026 Starter Relay — Waterproof, 700A Surge Capacity","description":"\u003cp\u003e\u003cstrong\u003eRECOIL 500 Amp Mobile Audio Battery Isolator and High Current Starter Relay separates and protects dual battery systems while delivering up to 500A continuous and 700A surge for reliable starts and heavy audio loads.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for vehicles with dual batteries, aftermarket audio systems, winches, or auxiliary power banks, this compact relay\/isolator combination keeps your starter battery reserved while allowing high current flow when needed. The RECOIL BRL500 is engineered to reduce unnecessary drains, avoid the voltage loss typical of diode isolators, and offer corrosion-resistant, waterproof performance for demanding mobile environments.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the BRL500 prevent one battery from draining another?\u003c\/h3\u003e\n\u003cp\u003eThe BRL500 acts as an intelligent high-current mechanical relay that connects batteries only when charging voltage is present or when starter support is needed, and isolates them when the engine is off. This prevents loads on accessories from drawing down the main starting battery.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatically isolates batteries when alternator output is absent\u003c\/li\u003e\n  \u003cli\u003eAllows charging to share when alternator voltage is available\u003c\/li\u003e\n  \u003cli\u003eStops backflow that would let audio or accessories discharge the starter battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it handle big audio amplifiers and heavy starting loads?\u003c\/h3\u003e\n\u003cp\u003eYes — the BRL500 is specified for 500 amps continuous current and tolerates 700 amps surge, matching the needs of large audio systems, high-draw accessories, or demanding starter assistance. Its heavy-duty contacts and alloy materials are built to carry the instantaneous currents common in vehicle starting and audio peaks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e500A continuous capacity for sustained loads or large amplifiers\u003c\/li\u003e\n  \u003cli\u003e700A surge handling for engine cranking and transient peaks\u003c\/li\u003e\n  \u003cli\u003eRobust terminals for thick cable connections and minimal heating\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the BRL500 compare to conventional isolators and relays?\u003c\/h3\u003e\n\u003cp\u003eUnlike diode-based isolators that create a voltage drop, the BRL500 provides a direct low-resistance connection when engaged, so the second battery receives full charging voltage. Compared with simple solenoids, this unit is engineered for mobile audio and accessory setups with weatherproofing and prolonged durability in mind.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo significant voltage drop to the auxiliary battery while charging\u003c\/li\u003e\n  \u003cli\u003eWaterproof construction suited for off-road and marine exposure\u003c\/li\u003e\n  \u003cli\u003eDesigned specifically for mobile audio and high-current starter applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation and maintenance should I expect?\u003c\/h3\u003e\n\u003cp\u003eInstallation typically requires mounting the relay near the batteries and running appropriately gauged cables between batteries, alternator, and starter. Periodic checks of cable terminations and the relay housing are recommended for long-term reliability, especially in salt or mud-prone environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMount in a protected, ventilated area close to battery bank\u003c\/li\u003e\n  \u003cli\u003eUse heavy-gauge battery cable and secure terminals tightly\u003c\/li\u003e\n  \u003cli\u003eInspect seals and fasteners occasionally for corrosion or looseness\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The RECOIL BRL500 is aimed at vehicle owners and installers who run dual-battery setups, high-power mobile audio systems, winches, or other high-current accessories and need dependable isolation without charging voltage loss. It's a good fit for overlanders, marine users, emergency vehicles, and anyone who wants to protect their starting battery while ensuring auxiliary batteries receive full charging current under normal operation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the BRL500 handle audio amplifier peak currents?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It supports 500A continuous and 700A surge, suitable for most high-power mobile audio peaks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the isolator cause voltage drop to the auxiliary battery?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The BRL500 provides a low-resistance connection when engaged, avoiding the voltage drop of diode isolators.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RECOIL","offers":[{"title":"Default Title","offer_id":48079867052190,"sku":"B08GPJG9K2","price":87.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/recoil-brl500-front-view.jpg?v=1785773456","url":"https:\/\/northtrailauto.ca\/products\/recoil-500a-mobile-audio-battery-isolator-starter-relay-waterproof-700a-surge-capacity","provider":"North Trail Auto","version":"1.0","type":"link"}