2017 Chevrolet Tahoe Battery Size & Group

Quick answer

• BCI Group Size: H7 (also called 94R)
• Cold Cranking Amps (CCA): 800 CCA
• Reserve Capacity: 140 minutes
• Battery Type: AGM (Absorbent Glass Mat) is required.
• Terminal Layout: Top-post, with the positive terminal on the right (Layout 0).
• Physical Dimensions: Approximately 12.4" L x 6.9" W x 7.5" H (315mm x 175mm x 190mm).
• Dual-Battery Setup: Not applicable. The 2017 Tahoe uses a single battery.

Replacement battery options

When it's time to replace the battery in your 2017 Tahoe, several reputable brands offer a compatible Group H7/94R AGM battery. Here are some popular choices:

• Interstate: MTX-94R/H7
• DieHard: Platinum AGM Battery, Group Size H7, 850 CCA (Part # 94R-AGM)
• Optima: YELLOWTOP DH7 (Part # 9050-160)
• Odyssey: Performance Series ODP-AGM94R H7 L4 (Part # 94R-850)
• ACDelco: Gold 94RAGM

AGM vs flooded — which does this vehicle need?

Your 2017 Chevrolet Tahoe requires an Absorbent Glass Mat (AGM) battery. It is not optional. The fifth-generation Tahoe (2015-2020) is equipped with a sophisticated electrical system that includes a start-stop system and a regulated voltage control (RVC) charging system, sometimes referred to as a Battery Monitoring System (BMS). These systems are designed specifically for the charge/discharge characteristics of an AGM battery.

An AGM battery is designed to handle the frequent, deep cycling that occurs in a vehicle with a start-stop system. It also recharges much faster than a conventional flooded battery, which is essential for the RVC system to maintain battery health and fuel efficiency. Installing a standard flooded battery in a vehicle designed for AGM will lead to a very short service life for the new battery, unpredictable electrical system behavior, and potential damage to the vehicle's charging system.

Post-installation relearn / reset procedure

Unlike many older vehicles, the 2017 Tahoe requires a "relearn" or reset procedure after a battery replacement. The vehicle's Battery Monitoring System (BMS) needs to be informed that a new battery has been installed. This reset recalibrates the charging strategy for the new battery, ensuring optimal performance and longevity.

If you skip this step, the charging system will continue to operate as if the old, degraded battery is still in place, which can overcharge and damage the new battery, significantly shortening its lifespan. While some auto parts stores may have the scan tool required to perform this reset, it is often best left to a professional technician at a qualified repair shop.

The general procedure involves connecting a scan tool to the OBD-II port and navigating to the Body Control Module (BCM) or Engine Control Module (ECM) functions to find the "Battery Sensor Module Reset" or a similarly named command.

Signs of a failing battery

A failing battery in your Tahoe will usually provide several warning signs before it leaves you stranded:

• Slow Engine Crank: The engine turns over more slowly than usual when you try to start it.
• Warning Lights: A "Check Charging System" message or a battery icon may illuminate on the dashboard.
• Dimming Lights: Headlights and interior lights may dim, especially during engine start-up or when electrical accessories are running.
• Electrical Gremlins: Unpredictable behavior from the radio, power windows, or other electronics can be a sign of low or unstable voltage.
• Start-Stop System Inactive: The auto start-stop system may become disabled to conserve battery power.
• Swollen Battery Case: If the battery case appears bloated or swollen, it's a sign of internal damage and it should be replaced immediately.

Common battery issues for this generation

The 2015-2020 generation of Chevrolet Tahoes can experience battery-related issues, often tied to the complexity of the electrical system. Parasitic draw is a common complaint, where an electrical component continues to draw power after the vehicle is turned off, slowly draining the battery. This can be caused by faulty modules, aftermarket accessories, or software glitches. If your battery repeatedly dies even after being replaced, a parasitic draw test should be performed by a qualified technician to isolate the source of the problem. Failure to properly reset the BMS after a replacement is another primary cause of premature battery failure in these trucks.

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