Battery Accessories

Battery Accessories: the hardware that keeps your battery mounted, charged and wired right

The gear in this category does the jobs a bare battery can't do for itself: hold it down so it doesn't shift under load, isolate a second battery so your starter draw stays separate from your accessory draw, and keep the charge topped up when the vehicle sits. These battery accessories are the tie-downs, boxes, isolators, chargers and terminal cables that turn a loose cell into a properly installed part. If you've ever had a battery slide in a hard corner or come back to a dead one after a month parked, this is the shelf you were looking for.

What ThreePiece stocks

There are 85 products here spanning 19 brands, with prices currently running from $1 to $349 for what's in stock right now (that's the live range, not a fixed price). The deepest lines are CTEK with 16 items and Battery Tender with 14, followed by Antigravity Batteries, Bike Master, Bikers Choice, Perrin Performance, Moroso and REDARC. You'll also find Torque Solution, Yuasa Battery, Mishimoto, Skunk2 Racing, Cusco, DEI, Hella and Kartboy across the range.

Concrete examples: the REDARC Smart Start SBI Battery Isolator 12V 200A at the top of the range, its 100A wiring-kit sibling for dual-battery builds, the Moroso sealed battery box with mounting hardware, and a Battery Tender ring-terminal cable jar of 25 for shop use.

How to choose

Start with the job. If you're securing a battery that moves, you want a tie-down or a box like the Cusco or Moroso pieces. If you're running accessories off a second battery, an isolator or an isolator wiring kit keeps your cranking battery protected. If the vehicle sits, a maintainer and the right terminal cables matter more than anything else. The price spread reflects this: a single terminal cable or adapter sits near the bottom, while a high-amp isolator sits near the top. Buy for the amperage and mounting your build actually needs rather than the biggest number on the shelf.

What else you need with it

The obvious partner is the battery itself, from our batteries category. From there, the rest of the Engine Components section covers the supporting hardware: fittings and adapters for wiring and plumbing runs, plus fuel pumps and radiators if you're deep in an engine-bay refresh.

Fitment and ordering

Only 7 of these products carry specific vehicle fitment data, with a year range of 1973 to 2013. Named coverage includes Harley-Davidson models such as the XL, Softail, FX and Dyna, plus the Subaru BRZ, Scion FR-S and Toyota 86 (the Cusco tie-down is built for that BRZ/FR-S/86 platform). Most accessories here are universal by design, so confirm terminal size and mounting before you order. If you're unsure, call our team for fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.

Battery Accessories: the hardware that keeps your battery mounted, charged and wired right

The gear in this category does the jobs a bare battery can't do for itself: hold it down so it doesn't shift under load, isolate a second battery so your starter draw stays separate from your accessory draw, and keep the charge topped up when the vehicle sits. These battery accessories are the tie-downs, boxes, isolators, chargers and terminal cables that turn a loose cell into a properly installed part. If you've ever had a battery slide in a hard corner or come back to a dead one after a month parked, this is the shelf you were looking for.

What ThreePiece stocks

There are 85 products here spanning 19 brands, with prices currently running from $1 to $349 for what's in stock right now (that's the live range, not a fixed price). The deepest lines are CTEK with 16 items and Battery Tender with 14, followed by Antigravity Batteries, Bike Master, Bikers Choice, Perrin Performance, Moroso and REDARC. You'll also find Torque Solution, Yuasa Battery, Mishimoto, Skunk2 Racing, Cusco, DEI, Hella and Kartboy across the range.

Concrete examples: the REDARC Smart Start SBI Battery Isolator 12V 200A at the top of the range, its 100A wiring-kit sibling for dual-battery builds, the Moroso sealed battery box with mounting hardware, and a Battery Tender ring-terminal cable jar of 25 for shop use.

How to choose

Start with the job. If you're securing a battery that moves, you want a tie-down or a box like the Cusco or Moroso pieces. If you're running accessories off a second battery, an isolator or an isolator wiring kit keeps your cranking battery protected. If the vehicle sits, a maintainer and the right terminal cables matter more than anything else. The price spread reflects this: a single terminal cable or adapter sits near the bottom, while a high-amp isolator sits near the top. Buy for the amperage and mounting your build actually needs rather than the biggest number on the shelf.

What else you need with it

The obvious partner is the battery itself, from our batteries category. From there, the rest of the Engine Components section covers the supporting hardware: fittings and adapters for wiring and plumbing runs, plus fuel pumps and radiators if you're deep in an engine-bay refresh.

Fitment and ordering

Only 7 of these products carry specific vehicle fitment data, with a year range of 1973 to 2013. Named coverage includes Harley-Davidson models such as the XL, Softail, FX and Dyna, plus the Subaru BRZ, Scion FR-S and Toyota 86 (the Cusco tie-down is built for that BRZ/FR-S/86 platform). Most accessories here are universal by design, so confirm terminal size and mounting before you order. If you're unsure, call our team for fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.