2020 Toyota Highlander Battery: Group Size, CCA, and Replacement Options

Quick answer

• BCI Group Size: Group H6 / 48
• Cold Cranking Amps (CCA): 680-760 CCA
• Terminal Layout: Left-hand positive (standard for this group size)
• Technology: AGM (Absorbent Glass Mat) is recommended.

Replacement battery options

• Interstate MTX-48/H6
• DieHard Platinum AGM H6
• ACDelco 48AGM
• Optima YELLOWTOP DH6

AGM vs flooded — which does this vehicle need?

The 2020 Toyota Highlander requires an AGM (Absorbent Glass Mat) battery, particularly models equipped with start-stop technology. AGM batteries are designed to handle the frequent, rapid discharge and recharge cycles that occur in vehicles with this feature. They provide superior performance and a longer lifespan under these demanding conditions compared to traditional flooded lead-acid batteries. Installing a non-AGM battery in a vehicle designed for one can lead to premature battery failure and potential issues with the vehicle's electrical systems.

Post-installation relearn / reset procedure

After replacing the battery in your 2020 Highlander, some of the vehicle's systems may need to be reset or recalibrated. While the engine should start and run without any special procedures, you may notice that settings for the radio, navigation, and power windows are lost. The power window auto-up/down feature, for example, will likely need to be re-initialized by holding the switch in the "up" position for a few seconds after the window is fully closed.

Signs of a failing battery

• Slow engine crank: The engine turns over more slowly than usual when you try to start it.
• Warning lights: A battery or check engine light may illuminate on the dashboard.
• Dim lights: Headlights and interior lights may appear dimmer than normal, especially when the engine is off.
• Electrical issues: You may experience problems with the radio, power windows, or other electrical accessories.

Common battery issues for this generation

The fourth-generation Highlander (2020-present) is packed with advanced electronics, which can increase the electrical load on the battery. The most common issue is premature battery wear due to the demands of the start-stop system and the numerous onboard computers. Using an incorrect battery type (flooded instead of AGM) or a battery with a lower CCA rating than specified can exacerbate these problems, leading to a shorter battery life and potential electrical gremlins.

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