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Toyota Avalon 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the engine bay of a 4th generation 2013 to 2017 Toyota Avalon.

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2016 Avalon 3.5L V6
12V Car Battery
Loosen Counterclockwise
This automotive maintenance tutorial was specifically written to assist owners of the fourth generation (2013, 2014, 2015, 2016, 2017 and the revised 2018 model year) Toyota Avalon sedan equipped with the 2GR-FE 3.5 liter V6 motor in changing a dead 12V automotive battery in the engine bay.

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.

10mm Bolt Removed
Swing Away Hold Down Bar
Loosen Negative Terminal
The first two steps are to open the hood and then move to the right side of the engine bay.

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.

Pull Off "-" Terminal
Cover & Tuck Away
Flip Open Red Cover
Pull the negative terminal off the "-" battery post.

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.

Loosen Positive Terminal
Pull Off Positive Terminal
"+" Terminal Removed
Loosen the positive terminal nut by turning it counterclockwise with the 10mm socket and a 1/4" drive ratchet.

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.

Old Battery Removed
Clean Off Battery Tray
Lower In New Battery
Carefully lift the old battery out of the engine bay and gently rest it on the ground.

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.


Battery Hold Down Clamp
"J" Hook Bar
Re-Insert "J" Hook Bar
Lower the battery hold down bar back in to place over the center of the new battery.

Avoid making contact with the battery terminals.

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

Spin In 10mm Bolt
Tighten Clockwise
Tighten 10mm Nut
Spin the 10mm bolt in to the front of the battery hold down bar a few turns by hand to prevent it from becoming cross threaded.

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 On Positive Terminal
Tighten 10mm Clockwise
Close Red Cover
If you've had a problem with corrosion (white or blue powder) building up on the battery terminals, consider installing some anti-corrosion felt washers on to the battery posts.

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.

Push On Negative Terminal
Tighten "-" Terminal Nut
12V Battery Replaced
Push the negative terminal on to the "-" battery post.

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.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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