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Toyota Tacoma 12V Automotive Battery Replacement Guide
How to change a weak or dead 12 volt car battery in a 3rd generation 2016 to 2021 Toyota Tacoma pickup truck.

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2020 Tacoma 3.5L V6
12V Battery & Fuse Box
Loosen Counterclockwise
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2016, 2017, 2018, 2019, 2020, 2021 and probably also the 2022 and 2023 model years) Toyota Tacoma pickup truck equipped with the 2GR-FKS 3.5 liter V6 engine in changing a weak or dead 12 volt car battery.

Owners of other Toyota or Lexus vehicles such as the Tundra, 4Runner, Hilux, Highlander, C-HR, Avalon, Camry, Corolla, Supra, Land Cruiser, Prius, RAV4, Mirai, Sequoia, Sienna, Yaris, CT 200h, ES 300h, RX 350, GX 460, LX 570, NX 300, RX 450h, UX 200 and UX 250h may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) 12V battery in this 2020 Tacoma TRD Sport was a "Group Size" number 24F and the genuine Toyota part number is 28800-03047 80D26L.

Your truck might have been equipped with a slightly larger group size 27F battery if it has the towing package.

The smaller group size 35 battery will also work if you can't find the larger 24F or 27F options.

A few compatible replacement replacement aftermarket 12V automotive batteries with their part numbers include the following: Optima YELLOWTOP 8037-127 D27F, Exide Edge FP-AGM24F and Optima REDTOP 8020-164 35.

The tools needed to complete this procedure include a deep well 10mm socket with a 1/4" ratchet or a standard 10mm wrench.

The first two steps are to open the hood and move to the right (driver) side of the engine bay.

Slightly loosen the two nuts on the top of the battery hold down bar or "clamp" by turning them in the counterclockwise direction with the deep well 10mm socket and a 1/4" drive ratchet or a 10mm wrench.


Release "J" Hook Bar
Hold Down Clamp Off
Loosen Negative Terminal
You don't have to fully remove the two 10mm nuts.

Just loosen them enough for you to detach the two "J" hooks at the bottom of the bars.

Carefully remove the two "J" hooks from their mounting brackets.

Avoid making contact with the terminals or the battery posts!

Lift off the hold down clamp and set it aside in a safe place.

Loosen the nut on the negative "-" terminal by turning it in the counterclockwise direction with a 10mm socket and a 1/4" drive ratchet.

Pull Off Negative Terminal
Cover & Tuck Away
Flip Open Plastic Cover
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.

Flip open the red plastic cover on the positive "+" terminal. (The terminal cover might be rubber on your truck.)

Loosen Counterclockwise
Pull Off Positive Terminal
Tuck Away On Left Side
Loosen the positive terminal nut by turning it in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

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

Tuck the positive terminal away on the left side of the old battery.

Lift Out Old Battery
Clean Off Battery Tray
Lower In New Battery
The original battery in this 2020 Tacoma TRD sport was part number 28800-03047 80D26L (Group 24F 582 CCA Cold Cranking Amps 125 Minute Reserve Capacity).

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

If you've had a problem with corrosion (white or blue powder) building up on the terminals or the cables, consider installing some felt anti-corrosion washers over the battery posts.

You could also apply some CRC Battery Terminal Protector spray on the terminals, posts and cables.

Carefully lower the new battery down into the engine bay.

The positive "+" battery post should be situated on the left (passenger) side closer to the engine and the negative "-" battery post should be located on the right (driver) side near the outside of the vehicle.

Push On Positive Terminal
Tighten Nut Clockwise
Close Red Plastic Cover
First, push the positive terminal over the "+" battery post.

Tighten the terminal nut in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until it is snug.

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

Flip the red cover closed over the positive terminal.

Lower Hold Down Bar
Re-Attach Rear "J" Hook
Re-Insert Front "J" Hook
Carefully lower the two "J" hook bars and the hold down bar on to the new battery.

Re-insert the two "J" hooks into the holes on their mounting brackets on the front and rear edge of the tray.

Avoid making contact with the terminals or the posts.

Tighten Two Nuts
Secure Negative Terminal
12V Battery Replaced
Tighten the two nuts on the hold down clamp in the clockwise direction with the deep well 10mm socket and a 1/4" drive ratchet or a 10mm wrench until they are snug.

Check to see if the new battery can be moved, rocked or slid around on the tray.

If the new battery can be moved, tighten the two nuts on the hold down clamp an extra turn or two.

Please remember to adjust the time on the clock and re-program your favorite radio stations before you start driving.

Be sure to write down the battery change in your truck's service records.

Please check out all of the 2016-2021 Toyota Tacoma 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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