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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 20 in Battery Accessories

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

500 Amp Relay Isolator (BIR500)

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

$59.99

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

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

Get 20% Off XS Power 586 M6 Brass Terminal Post Adapter Kit

$10.99

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

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

$5.99

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

GM Battery Post Extender

• HPP plating for superior corrosion resistance
•Custom tooled solid brass
• Allows additional power or ground connections
• Contains One (1) Terminal Bolt

$7.97

IN STOCK

PRO Classic Battery Terminal (1) 1/0ga + (1) 4ga + (2) 8ga Outputs Shoc-Krome (Positive)

• Positive Battery Terminal
• Shoc-Krome-plated Output
• Impact resistant covers
• One 4 Gauge Output
• One 1/0 Gauge Output
• Two 8 Gauge Outputs

$24.99

IN STOCK

Terminal Posts For Kinetik Power Cells

• Power Top Post
• Silver Plated Brass

$7.99

IN STOCK

Ultra-Compact Universal Brass Battery Connector Terminal with Marine-Grade Stannum Plating - Positive or Negative

Ultra-Compact Battery Connector, Positive or Negative • 10 - 4 Gauge • High-Temperature Polycarbonate Cover • Marine-Grade Stannum Plating

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$19.99

IN STOCK

Only 1 Left!

PRO Series Classic Short GM Battery Post Shoc-Krome (Positive or Negative)

• Provide maximum current transfer
• Chrome finish
• Deep wire recesses
• Oversized set screws

$4.99

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

Get 20% Off XS Power 580 M6 Brass Terminal Post Adapter Kit

$13.97

IN STOCK

Positive/Negative Battery Terminal w/ Platinum Finish - (2) 1/0 AWG/4 AWG Input (2) 8 AWG inputs

• 4 AWG or 1/0 AWG Positive-Negative Battery Terminal
• Custom Tooled Brass
• HPP Plating
• Strong Plastic Casing

$26.99

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

$5.99

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

$3.99

IN STOCK

Platinum-Plated Short GM Battery Terminal Posts

• Short GM Battery Terminal Posts
• Platinum-Plated for Maximum Conductivity
• Works with Both Positive and Negative Terminals
• Retains Factory Connections

$4.99

IN STOCK

Only 1 Left!

PRO Series Classic Long GM Battery Post w/ Shoc-Krome Plating (Positive or Negative)

• Provide maximum current transfer
• Chrome finish
• Deep wire recesses
• Oversized set screws

$6.99

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

$50.97

IN STOCK

Only 2 Left!

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