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

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

  • 4.9
7 reviews

200 Amp Relay Isolator (BIR200)

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

Add an NVX Battery Isolator to your Battery Purchase.

$39.99

IN STOCK

  • 5.0
1 review

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

• 4 Gauge Firewall Grommet
• IP68 Waterproof Rating
• Protects Cables When Installing Through a FIrewall
• Sold Individually

$1.99

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

$15.95

IN STOCK

  • 5.0
1 review

0/4/8GA Core Universal Battery Terminal

• Positive or negative battery terminal
• Accepts 0 AWG, 4 AWG or 8 AWG cable
• Clamp-type terminal
• Strong polycarbonate protective cover

$8.99

IN STOCK

  • 5.0
1 review

0 Gauge (1" Mounting Hole) Waterproof Firewall Grommet

• 0 Gauge Firewall Grommet
• IP68 Waterproof Rating
• Protects Cables When Installing Through a FIrewall
• Sold Individually

$7.99

IN STOCK

GM Short Battery Terminal (+ or - )

• Short Battery Terminal
• Unisex Design
• 100% Brass Construction

$7.99

IN STOCK

Only 2 Left!

  • 5.0
4 reviews

200 Amp Circuit Breaker

• 1/0-AWG / 4-AWG inputs
• Platinum plated
• Low-resistance, high-current ability
• Set screw style connection - no need for ring terminals

$27.99

IN STOCK

  • 5.0
3 reviews

4 Gauge Positive/Negative Battery Terminal

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

$10.99

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

$8.99

IN STOCK

  • 4.8
6 reviews

8,000W Peak (4,000W RMS) Arachnid Series Class-D Monoblock 1-Ohm Stable Amplifier

• 1500 Watts RMS x 1 @ 4 ohms
• 2500 Watts RMS x 1 @ 2 ohms
• 4000 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 8000 Watts
• Built-in low-pass filter
• Variable Bass Boost
• Aluminum Heatsink
• 8.5" W x 18.5" L x 2" H

Save 25% on a 4 Gauge Amp Kit with Purchase!

$190.99

IN STOCK

  • 4.5
4 reviews

80 Amp Battery Isolator and Relay

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

$11.99

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

$52.99

IN STOCK

  • 5.0
9 reviews

Terminal Posts For Kinetik Power Cells

• Power Top Post
• Silver Plated Brass

$10.99

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

$22.99

IN STOCK

  • 4.6
5 reviews

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

$10.99

IN STOCK

  • 4.5
6 reviews

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

  • 5.0
3 reviews

150 AMP Circuit Breaker with Manual Reset

• Manual Reset Circuit Breaker
• Power Rating: 150 Amps
• Push Button Reset
• Water Resistant Housing
• Integrated Holes for Simple Mounting
• Compact and Lightweight Design

$23.99

IN STOCK

Positive or 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

  • 4.9
7 reviews

200 Amp High Current Power Relay Battery Isolator

• 200 amp Battery Isolator and Relay
• Prevents primary battery discharge
• Maximum current transfer
• Extends battery life
• Universal 12V Applications

$48.95

IN STOCK

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