CROWN INDUSTRY 500a split charge relay for isolating 2nd battery
SKU: 48025551978

CROWN INDUSTRY 500a split charge relay for isolating 2nd battery

Sale price$72.00 Regular price$80.00
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USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 7 - Jul 12

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Description

CROWN INDUSTRY 500a split charge relay for isolating 2nd batteryThis relay Perfect for isolating one of our lithium batterys when in conjunction with the factory oem battery preventing our lithium from draining down to the float voltage of the oem factory battery. Giving a longer life span to the lithium and putting less stress on the alternator and engine when starting the vehicle. Our RLY 500 is Ideal for 2nd battery isolation, our high current relay is the most reliable and efficient way to add secondary

This relay Perfect for isolating one of our lithium battery’s when in conjunction with the factory oem battery preventing our lithium from draining down to the float voltage of the oem factory battery. Giving a longer life span to the lithium and putting less stress on the alternator and engine when starting the vehicle. 

Our RLY-500 is Ideal for 2nd battery isolation, our high current relay is the most reliable and efficient way to add secondary batteries to your system. Compatible with all types of alternators and charging systems, simply connect these relays to operate when the ignition is turned on. The battery systems remain separate while the ignition is off, preventing system drain. Water resistant black phenolic plastic, 100,000 mechanical cycle life. With a  500 amp contact rating.

  • Prevents primary battery discharge
  • Maximum current transfer 
  • Ideal for 2nd audio battery isolation from vehicle systems
  • High current relays are the most reliable and efficient way to add secondary batteries to your system
  • Compatible with all types of alternators and charging systems
  • Water resistant black phenolic plastic
  • 100,000 mechanical cycle life
  • 500A constant 900A peak current
  • Compatible with all types of LITHIUM, AGM, LEAD ACID batteries 
  • m8 input and output studs 
  • m5 studs for the energisation coil 
  • 95mm tall x 67mm wide 
  • 12 month warranty 
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 48025551978

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Mateo filer
Port Orchard, US
★★★★★ 5
Quality
Color: Red/Black, Size: 0AWG-25FT Each
Great quality.Better than I was expected
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026
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S. Rohleder
Grantham, US
★★★★★ 5
0 Gauge wire 25 feet red,/25 feet black.
Color: Red/Black, Size: 0AWG-25FT Each
It is as advertised, Copper Clad Aluminum (CCA) but will work for very short runs and jumpers instead of eating my solid copper lines.
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Reviewed in the United States on March 5, 2026
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Chad Whitsell
Dallas, US
★★★★★ 5
Great product
Color: Red/Black, Size: 0AWG-25FT Each
Just the amount you need
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Reviewed in the United States on February 11, 2026
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Mr.FixIt
Bozeman, US
★★★★★ 5
Works great
Great product, good price and fast shipping.
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Reviewed in the United States on December 5, 2025
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Lowell H
Fort Morgan, US
★★★★★ 5
Good price and high quality!
This isolator relay is robust and has a higher amp load rating than the original relay. It was easy to install.
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Reviewed in the United States on May 26, 2026

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