2020–2024 Toyota Supra

2020-2024 Toyota Supra - Battery Replacement

By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026

🔧 Easy 25–40 minutes $140 DIY

Save $140 by doing it yourself! Shop cost: $280

Quick answer: Battery Replacement on a 2020–2024 Toyota Supra is rated Easy and takes about 25–40 minutes. You'll need 5 tools for this job, and parts cost about $140. This guide walks you through the full job step by step, including the mistakes to avoid.

Quick Video Tutorial

Parts You Need

Total Cost

$140.00

Part Name	Part Number	Price	Buy
Correct group-size battery	—	$140.00	Amazon
Terminal cleaner Optional	—	$8.00	Amazon
Terminal protectant Optional	—	$7.00	Amazon

About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

Head to the trunk

Thanks to its BMW underpinnings, the Supra's 12V battery isn't under the hood — it sits in the trunk under the floor panel. Park on level ground, switch the car fully off, and open the trunk.

Lift the trunk floor panel

Remove the trunk floor panel and any mats to expose the battery well, which sits on the right side of the trunk. Note the terminal positions and where the vent hose runs before you disturb anything.

Disconnect negative first

Loosen the negative terminal nut with your socket, lift the cable off, and move it well clear of the battery. Then disconnect the positive cable. As always: the negative cable comes off first and goes back on last.

Pull the vent hose

Because the battery lives inside the car, a vent hose routes gases out through the trunk floor. Pull the hose off the battery's vent port — you'll reconnect it to the new battery before you finish.

Unbolt the hold-down and lift the battery out

Undo the hold-down bracket's bolt, lift the bracket away, and then lift the battery straight up and out of the well. It's a full-size AGM unit and heavy, so keep it level and use both hands.

Install the new battery

Lower the replacement into the well in exactly the same orientation. Push the vent hose firmly onto the new battery's vent port, refit the hold-down bracket, and tighten its bolt so the battery is locked in.

Reconnect

Reconnect the positive cable first and snug it down, then reconnect the negative cable last. Refit the trunk floor panel and start the car. The clock, radio presets, and one-touch windows may have reset — and because this is a BMW-based electrical system, check the owner's manual about battery registration so the car charges the new battery correctly.

All Done!

Test your repair before closing everything up. If something doesn't work right, double-check your steps.

⚠️ Common Mistakes to Avoid

• Forgetting to reconnect the vent hose — gases would then vent into the trunk
• Skipping the battery registration step this platform expects
• Scratching the trunk trim by dragging the heavy battery across it
• Mixing up the cables because the new battery was placed in the wrong orientation