Recoil BRL500 Review: 500 A Battery Isolator and How It Differs From the SRL500
The Recoil BRL500 is a 500 A battery isolator with a 700 A surge rating and terminals, for dual-battery car audio and accessory systems. Its Indian MRP is ₹10,000. Recoil says it lets the alternator charge more than one battery, keeps the main battery from being drained when the vehicle is not running and, unlike a conventional diode isolator, does not create a voltage drop to the second battery. Its pages do not say how it switches. The isolator is on our Recoil BRL500 product page.
Quick summary
The ratings are 500 A continuous and 700 A surge. They are current ratings, not an amplifier-power figure.
Recoil says there is no voltage drop to the second battery, and its US page puts the typical loss of standard diode isolators at 0.6 to 0.7 V. Neither page says how the BRL500 avoids that loss.
The pages give no switching points, manual override or dual sensing. The ₹15,000 MRP Recoil SRL500 lists all three.
Recoil publishes no wiring diagram, terminal details or IP rating, and we found no owner or reviewer write-ups.
Recoil BRL500 specifications
Specification | Recoil BRL500 |
|---|---|
Type | Battery isolator; switching method not stated |
Current | 500 A continuous; 700 A surge |
Voltage drop to the second battery | None, per Recoil; the US page says it delivers full voltage to the secondary battery |
Battery protection | Per Recoil, stops the battery bank cross-draining and keeps the main battery from being drained with the engine off |
Weather protection | Waterproof; the US page says rated for harsh weather and under-hood environments; no IP rating given |
Supplied | Terminals; count, size and type not stated |
Size and weight | 3.93 x 2.95 x 3.81 in (about 100 x 75 x 97 mm); 1.79 lb (0.8 kg) |
Not published | Switching points, manual override, dual sensing, wiring diagram, fuse or cable advice, battery types |
India MRP | ₹10,000 |
The figures come from our listing and Recoil's BRL500 page on its main site and US store page, both promotional. Size and weight are on the main-site page only, and the US page has an empty specifications section. Metric figures are our conversions of Recoil's inches and pounds.
What a battery isolator is for
A car's alternator charges the main battery, which also starts the engine. If you add a second battery for a large audio system or accessories, an isolator lets the alternator charge both while keeping the second battery's load from draining the starting battery with the engine off. That is the job Recoil describes, and its US page calls the BRL500 designed for dual-battery and high-demand car audio systems. An isolator does not add capacity. It manages how the two batteries share charging and load.
What no voltage drop does and does not tell you
A conventional diode isolator passes current one way, which costs it a small voltage across the diode. Recoil's US page puts that loss at 0.6 to 0.7 V for standard diode isolators and says the BRL500 delivers full voltage to the secondary battery. That is a maker claim. Neither page says how the BRL500 switches, so we cannot say whether it uses a relay, a solid-state switch or something else, and neither gives a voltage at which it connects or disconnects the batteries. The SRL500 lists such points, 13.2 V and 12.7 V, which is the clearest difference between the two.
Recoil BRL500 or SRL500
Specification | Recoil BRL500 | Recoil SRL500 |
|---|---|---|
Type | Battery isolator; switching method not stated | Microprocessor-controlled smart isolator and starter relay |
Current | 500 A continuous, 700 A surge | 500 A continuous at 12 V, 700 A surge |
Switching points | Not published | 13.2 V connect, 12.7 V disconnect |
Dual sensing | Not listed | Yes |
Manual override | Not listed | Waterproof switch, 60 seconds |
Supplied | Terminals, unspecified | Two 1/0 AWG copper ring terminals; heat-shrink tubing |
Size and weight | About 100 x 75 x 97 mm; 0.8 kg | About 89 x 76 x 104 mm; 0.9 kg |
India MRP | ₹10,000 | ₹15,000 |
The SRL500 costs ₹5,000 more at MRP and adds the published switching points, dual sensing and a manual override. The BRL500 has the lower MRP, so it suits a build where you can live without those or where the maker confirms how it switches. Our Recoil SRL500 post covers the smart model.
Fitting notes for Indian cars
Recoil's pages give no installation steps, so follow its manual. A dual-battery install carries high current, so cable size and fusing matter, and Recoil publishes figures for neither. The title says with terminals, but their count, size and type are not stated, so check what is in the box before buying cable lugs. Mount the isolator in a dry place close to the batteries. Recoil's US page calls it rated for harsh weather and under-hood environments, but neither page gives an IP rating or a temperature range. Downstream, a fused block such as the Recoil S-MPG4 can split power to up to four amplifiers. VA3 Car Studio in Ghaziabad offers professional installation.
What owners and reviewers say about the Recoil BRL500
We looked for owner and reviewer feedback in October 2026 and found nothing we could read for the BRL500. Recoil's main-site page shows Reviews (0) and its US page shows none. Our tools could not read Amazon, Walmart or Reddit, and forum and retailer search pages did not load, so feedback may exist that we could not see.
Who should buy it, and who shouldn't
Buy the BRL500 if you have, or plan, a second battery for engine-off listening or accessories, want the main battery kept from draining, and accept that Recoil leaves out the switching method. Our guide to the need for an amplifier in car sound systems covers the load side.
Look elsewhere if you need published switching voltages, a manual override or dual sensing, which points to the SRL500. Also look elsewhere if you need a wiring diagram or an IP rating before buying, or if you run one battery, since an isolator then has nothing to isolate.
Price and where to buy
The Recoil BRL500 carries an India MRP of ₹10,000. We often sell below MRP, so check today's price on the Recoil BRL500 product page. Our listing describes it as a genuine Recoil product.
The bottom line
The BRL500 is the simpler of the two Recoil 500 A isolators we list, at ₹10,000 MRP, with a no-voltage-drop claim, a 700 A surge rating and waterproof construction. How it switches, what its terminals are and how it is wired are not published, so ask the maker or distributor first, and look at the SRL500 if you want published switching points.
Recoil BRL500 FAQ
What does the Recoil BRL500 do?
Recoil says it lets the alternator charge more than one battery while keeping the main battery from being drained when the vehicle is not running, with no voltage drop to the second battery.
What is the difference between the Recoil BRL500 and SRL500?
The BRL500 is the simpler 500 A isolator at ₹10,000 MRP. The SRL500 is a smart isolator at ₹15,000 MRP that lists 13.2 V and 12.7 V switching points, dual sensing and a manual override.
Does the BRL500 have a voltage drop?
Recoil says it does not create a voltage drop to the second battery like a conventional isolator, and its US page puts the typical diode isolator loss at 0.6 to 0.7 V. It does not say how the BRL500 avoids the loss.
Is the BRL500 waterproof?
Recoil's pages claim waterproof performance, and its US page says rated for harsh weather and under-hood environments, but neither gives an IP rating, so we cannot state one.
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