Owners of other Toyota, Lexus and Scion vehicles such as the 4Runner, Avalon, 86, C-HR, Camry, Corolla, iM, Land Cruiser, Mirai, Prius, RAV4, Sequoia, Sienna, Tacoma, Tundra, Yaris, FR-S, xB,  xD, tC, xA, CT 200h, ES 250, ES 300, ES 330, ES 350, IS 250, IS 350, RX 300, GS 250, NX 300 and RX 350.

The "group size" of the original OEM 12V battery is 24F. You can also use group size 35 batteries as well.

A few compatible replacement 12 volt batteries with their part numbers are as follows: DieHard 38275, Delphi BU9035, EverStart MAXX-24F (Walmart) and Optima RedTop 35.

The tools needed to complete this procedure include a 10mm wrench or a deep well 10mm socket with a 3/8" drive ratchet.

The 12V car battery is located right behind the driver side headlight housing and in front of the air filter box.

Loosen the nut on the "J" hook bar at the rear of the battery hold down clamp by turning it in the counterclockwise direction with a 10mm wrench or a 10mm deep well socket with a 3/8" drive ratchet.

You don't need to fully remove the 10mm nut, just loosen it enough until you can pull the "J" hook at the bottom of the bar out of its socket on the battery tray.

Then remove the small bolt on the front edge of the battery hold down bar by turning it in the counterclockwise direction with a 10mm socket and a ratchet.

Set the 10mm bolt aside in a safe place.

Carefully lift the hold down clamp off the top of the battery.

Avoid making contact with the battery terminals or the posts.

Set the battery hold down clamp aside in a safe place.

Carefully pull the negative terminal off the "-" battery post.

Wrap the terminal in a small towel and tuck it away on the right side of the battery to help prevent accidental electrical contact.

Loosen the terminal nut by turning it in the counterclockwise direction with the 10mm socket and a ratchet.

Pull the positive terminal off the "+" battery post.

Close the red cover over the positive terminal and tuck it away on the left side of the battery to help prevent accidental electrical contact.

Avoid touching the positive "+" or negative "-" battery posts.

Gently set the old battery on the ground.

Do not tip over or drop the old battery to prevent from having acid leak out.

Be sure to take the old battery with you to Walmart or the auto parts store to prevent from having to pay a "core" charge or a "recycling" or "disposal" fee.

If you can wait a few days for delivery, I recommend buying the DieHard 38275 or Optima RedTop 35 batteries since they have excellent reviews on Amazon.

Clean off any debris on the black plastic battery tray so that the new battery will rest evenly on it.

The positive "+" post should be on the left (passenger) side and the negative "-" post should be situated on the right (driver) side of the battery.

If you've had a problem with corrosion (white or blue powder) building up on the terminals, I highly recommend installing some felt anti-corrosion washers to prevent any further damage to your terminals or battery cables.

Push the positive terminal on to the "+" battery post.

Tighten the 10mm terminal nut in the clockwise direction until it is snug.

Try to avoid over tightening the terminal nut to prevent from cracking or damaging the battery post which could cause an acid leak.

Push the negative terminal over the "-" battery post.

Tighten the terminal nut in the clockwise direction with the 10mm socket and a 3/8" drive ratchet until it is snug.

Avoid over tightening the terminal nut.

Avoid making contact with the battery terminals.

Replace the 10mm bolt at the front of the hold down bar by turning it in the clockwise direction.

Tighten the 10mm nut on the rear of the hold down clamp in the clockwise direction.

To test the new battery, start the engine and flash the high beams.

You could also use a digital multimeter to test the voltage of the new battery. It should be anywhere from just above 12 volts to just over 13 volts when it is fully charged. If the engine is running, the alternator should be charging the new battery at any where from above 13 volts to just over 14 volts.

Be sure to record the 12V car battery change in your vehicle's service records.

Please check out all of my 2014-2018 Toyota Highlander DIY Repair & Maintenance Guides.