Owners of other Toyota, Lexus and Scion vehicles such as the Yaris, Corolla, Matrix, Prius, Camry, RAV4, Sienna, Tacoma, Tundra, FJ Cruiser, Venza, Highlander, 4Runner, Sequoia, Land Cruiser, IS 250, IS 200t, IS 300, NX 200t, NX 300h, RX 350, RX 450h, LS 460, LS 600h, ES 350, ES 300h Hybrid, RC F, GS 350, CT 200h, LX 570, GX 460, tC, iA, iM, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

The OEM battery was a "Group Size" 24F from Johnson Controls part number 28800-03044.

A few compatible replacement 12V car batteries with their part numbers are as follows: Optima 8040-218 D35 YellowTop, Optima 8020-164 35 RedTop and Bosch S6508B S6.

The tools required to complete this procedure include a 10mm socket with a 1/4" drive ratchet or a 10mm wrench.

The 12 volt automotive battery is located on the right (driver) side of the engine bay to the left of the fuse box and in front of the engine air filter box.

Remove the bolt on the front of the battery hold down bar by turning it counterclockwise with a 10mm socket and a 1/4" drive ratchet.

Set the 10mm bolt aside in a safe place.

Carefully swing the hold down clamp over the left side of the battery and towards the engine air box.

Try to avoid making contact with the terminals or battery posts.

Loosen the negative terminal by turning the 10mm nut in the counterclockwise direction.

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

Flip open the red plastic cover on the positive terminal.

Pull the positive terminal off the battery post, push the red plastic cover over it and tuck it away on the left side of the battery.

Try to avoid dropping or tipping over the old battery to prevent from having battery acid leak out.

Clean off any debris from the plastic battery tray in the engine bay so that the new battery will rest evenly on it.

If you can wait a few days for delivery, the Optima 8020-164 35 RedTop battery has excellent reviews on Amazon.

Gently lower the new battery in to the engine bay with the positive post on the left (passenger) side and the negative post on the right (driver) side.

Avoid making contact with the battery terminals.

Re-insert the "J" hook bar in to the opening on the rear of the battery tray.

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

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

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.

Flip the red plastic cover closed over the positive terminal.

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

Test the new 12V battery by starting the engine and flashing the high beams.

Please remember to adjust the time on the clock and program your favorite radio station presets before driving.

For more, check out all of my Toyota Avalon DIY Repair & Maintenance Guides.