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Secondary car batteries need accessories so you can finish your install. Shop for fuses, terminals, isolators, relays and more!

Battery Accessories

Get all the accessories you need when installing a car battery. We've got terminals, isolators and relays so you can get your system thumpin'!
Battery Isolators & Relays
Battery Terminals
Battery Terminal Posts
Battery Chargers
Jumper & Booster Cables
Battery Wiring & Install Kits
Fuses & Fuse Holders
Circuit Breakers
Distribution Blocks
Grommets & Firewall Bushings

Top Sellers in Battery Accessories

500 Amp Relay Isolator (BIR500)

• 500 Amp Battery Isolator
• 500 Amps at 12V Continuous
• 700 Amps Surge
• Switching Power: 10 - 16 VDC

$49.99

IN STOCK

2 Pack of Satin Chrome-Plated Positive/Negative Battery Terminals with one 0/1 Gauge Input and two 4 Gauge Outputs

2 Pack of Positive or Negative Battery Terminal Clamp • Connects to the positive or negative battery terminal • Splits the connection to 3 outputs • One 1/0 and Two 4 AWG or 8 AWG outputs

$34.98

IN STOCK

80 Amp Relay and Battery Isolator

• 80 Amp Battery Isolator
• 80 Amps at 12V Continuous
• 150 Amps Surge
• Switching Power: 10 - 16 VDC

$9.99

IN STOCK

10 Pack of 0 Gauge Waterproof Grommets

• 10 Pack of 1/0 Gauge Waterproof Grommets
• Water Tight Seal
• Locks Securely as Bushing is Tightened
• Heavy Duty Construction
• Corrosion Resistant Material
• Provides a Safe Route for Running Power Cables Through the Firewall

$9.95

IN STOCK

Platinum Plated Universal +/- 0/4/8/8 Gauge Battery Terminal

• Platinum Plated Universal Battery Terminal
• Designed for high-current applications
• Superior performance for car audio wiring projects

$9.99

IN STOCK

4 Gauge (7/8" Mounting Hole) Firewall Waterproof Grommet

• 4 Gauge Firewall Bushing
• Water tight seal when power wires pass through metal
• Locks securely as bushing is tightened

$6.99

IN STOCK

200 Amp Relay Isolator (BIR200)

• 200 Amp Battery Isolator
• 200 Amps at 12V Continuous
• 300 Amps Surge
• Switching Power: 10 - 16 VDC

50% off an NVX Battery Isolator with your Battery Purchase.

$39.99

IN STOCK

Positive and Negative Battery Terminal Clamp with 3 Outputs

• Splits Connection to 3 Outputs
• Brass Construction
• 1/0 or 4-Gauge and 4 or 8-Gauge Outputs

$17.99

IN STOCK

Pair of 12 Volt Short Brass Battery Terminal Post Adapters M6

• Pair of 12-Volt Short Brass Terminal Post Adapters
• For Vehicles that Use "Short Style" Battery Posts
• High Quality M6 Threading
• Stainless Steel Hex-Head Bolts Included
• Compatible with All i-BAR Rails

Add an XS Power 580 M6 Brass Terminal Post Adapter Kit

$14.97

IN STOCK

Positive or Negative Competition Brass Battery Terminal with Two 1/0-8 Gauge and One 4-8 Gauge Output

• Positive or Negative Competition Battery Terminal with Two 1/0-8 Gaquge and One 4-8 Gauge Output
• Brass Construction
• (2) 1/0-4 Gauge out
• (1) 4-8 Gauge out
• No Fail Battery Terminal Includes a Negative Post Adapter Collar That Locks Into Place for Tight Grip and Best Connection

$19.95

IN STOCK

Pair of Tall Brass 12-Volt Terminal Post M6 Adapters for XS Power D925 & D1200 Power Cells

• Pair of Tall Brass 12-Volt Terminal Post M6 Adapters
• Compatible with All i-BAR Rails
• For Vehicles that Use "Tall Style" Battery Posts
• High Quality M6 Threading
• Stainless Steel Hex-Head Bolts Included

Add an XS Power 586 M6 Brass Terminal Post Adapter Kit

$11.99

IN STOCK

10 Pack of 8 Gauge Waterproof Grommets

• 10 Pack of 8 Gauge Waterproof Grommets
• Water Tight Seal
• Locks Securely as Bushing is Tightened
• Heavy Duty Construction
• Corrosion Resistant Material
• Provides a Safe Route for Running Power Cables Through the Firewall

$5.95

IN STOCK

Only 2 Left!

Positive and Negative Battery Terminal Clamp with 4 Outputs (2 1/0 or 4 Gauge and 2 8 Gauge)

• Splits Connection to 4 Outputs
• Brass Construction
• 1/0 or 4-Gauge and 4 or 8-Gauge Outputs

$19.99

IN STOCK

10 Pack of 4 Gauge Waterproof Grommets

• 10 Pack of 4 Gauge Waterproof Grommets
• Water Tight Seal
• Locks Securely as Bushing is Tightened
• Heavy Duty Construction
• Corrosion Resistant Material
• Provides a Safe Route for Running Power Cables Through the Firewall

$4.99

IN STOCK

4 Gauge Positive/Negative Battery Terminal

• 4 Gauge Positive/Negative Battery Terminal
• Solid Brass Construction
• High Tolerance Compact Molded ABS
• Water Resistant

$11.97

IN STOCK

Platinum Battery Terminal Accepts Any Size Gauge Cable w/ Ring Terminal & Pos/Neg Adapter

• Platinum Digital Battery Terminal
• Accepts Any Gauge Cable w/ Ring Terminal
• Includes Positive & Negative Adapter
• Fast and Easy Installation
• High Power Connection
• Screw Terminals Hold Cables Securely

$6.99

IN STOCK

1/0 AWG (1/0 Gauge) Firewall Bushing

• 1/0 Gauge Firewall Bushing
• Water tight seal when power wires pass through metal
• Locks securely as bushing is tightened

$8.99

IN STOCK

Universal Positive/Negative Satin Chrome Battery Terminal w/ 0/1 Gauge Input & 2 4 Gauge Outputs

• Positive or Negative Battery Terminal Clamp
• Connects to the positive or negative battery terminal
• Splits the connection to 3 outputs
• One 1/0 and Two 4/8 Gauge outputs

$17.99

IN STOCK

PRO Series Battery Terminal, Works w/ Both Positive and Negative Terminals

• PRO Series Battery Terminal
• Accepts Any 5/16” Ring Terminal
• One 4 Gauge and One 8 Gauge Output
• Works with Both Positive and Negative Terminals
• High power Connection
• Multiple Output Design

$10.99

IN STOCK

500 Amp Battery Isolator and Relay

• Battery Isolator and Relay
• 500 Amp
• Prevents Primary Battery Discharge
• Maximizes the Current Transfer
• Extends Battery Life
• Universal 12V Applications

$51.99

IN STOCK

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