T4R5 Single Battery Tray (Group 31)

Not every 4Runner build needs two batteries. Many owners just want one bigger, stronger battery that handles a winch, a fridge, trail lighting, and daily starts without the complexity of a dual battery system. The T4R5 Single Battery Tray (Group 31) makes that upgrade possible by replacing the factory battery tray in your 5th Gen Toyota 4Runner with a properly sized mount for a full-size Group 31 battery. The result is a cleaner, simpler power setup with real capacity, all in the same engine bay footprint.

Why the T4R5 Single Battery Tray Group 31 Upgrade Makes Sense

The factory 4Runner battery tray is sized for the smaller stock battery, which limits how much power you can carry without going to a full dual battery system. Swapping in this tray lets you fit a Group 31 battery in the main starter position, which gives you more reserve capacity, stronger cranking amps, and longer overall battery life. For owners running moderate trail gear, occasional camping loads, or a winch without going full overland, that single battery upgrade often hits the sweet spot between cost and capability.

Built for the 5th Gen 4Runner Engine Bay

This tray is shaped and sized specifically for the 5th Gen Toyota 4Runner platform, so the fit is clean, and the install does not require fabrication or guesswork. The mounting points line up with the existing engine bay structure, which keeps the upgrade simple and reversible. Builders who want a serious power upgrade without cutting up the truck get exactly that with this tray.

Fits Common Group 31 Battery Options

Group 31 is the standard size for high-capacity automotive and off-road batteries. This tray accepts popular Group 31 options from brands like Odyssey, Northstar, X2 Power, and Battle Born, so you can pick between AGM and lithium chemistries based on your budget and use case. The fit holds the battery snug and level, which protects the terminals and the case from trail vibration damage.

Heavy Duty Steel Build

A Group 31 battery is heavy, and the tray holding it needs to match. This tray uses heavy-gauge steel construction with reinforced corners and a solid base, so it carries the weight safely over years of daily use and off-road driving. The added strength matters most on washboard roads and rough trails, where a flimsy tray would let the battery shift and stress the cable connections over time.

Powder Coated Against Hawaii's Climate

The tray ships with a tough powder-coated finish that fights off corrosion from heat, humidity, and salt air. Engine bays already deal with constant temperature swings and chemical exposure, and Hawaii's island environment adds rain and ocean salt into the mix. The powder coat keeps the tray looking clean and structurally solid year after year.

Simpler Than a Dual Battery Setup

A dual battery system is powerful but adds complexity. You need an isolator, a DC to DC charger, dedicated wiring, fuse blocks, and a second tray. A single Group 31 upgrade skips all that by giving you more capacity in one battery. For drivers who do not need to run heavy electrical loads with the engine off, or who do not want to manage a second battery, this approach is faster to install, cheaper to set up, and easier to maintain long term.

Direct Bolt-on Install

The tray installs using factory mounting points in the engine bay, so the swap is straightforward. Remove the factory battery and tray, drop the new tray in, transfer or upgrade your cables, and seat the new Group 31 battery. Most owners can complete the install in a couple of hours with basic hand tools, including time to label and tidy the wiring while the battery is out.

Product Specifications

What You Get

Best For: 5th Gen Toyota 4Runner owners who want to upgrade the main starter battery to a full-size Group 31 for more capacity and cranking power, without taking on the complexity of a full dual battery system.

For Hawaii 4Runner drivers who want a smarter, simpler power upgrade for trail use, camping, or daily reliability, the T4R5 Single Battery Tray Group 31 setup delivers the right balance of capacity, build quality, and clean install. IMM Hawaii Parts also handles battery, wiring, and engine bay accessory installation at our Maui shop, so you can plan the upgrade and roll out with a stronger electrical system in one visit.