2025 Nissan Altima Battery Size & Group Guide

As an ASE-certified master technician, I regularly field questions about battery replacements on late-model vehicles. The 2025 Nissan Altima is packed with advanced electronics, from the ProPILOT Assist safety suite to high-end infotainment systems, and often features an auto start-stop system. This makes choosing the correct battery critical to keeping your sedan running smoothly.

Here is everything you need to know about replacing the battery in your 2025 Nissan Altima.

Quick answer: 2025 Nissan Altima Battery Specs

When shopping for a replacement battery, verify your engine type (2.5L 4-cylinder vs. 2.0L VC-Turbo), but generally, the specs you are looking for are:

• BCI Group Size: Group H5 (also known as Group 47). Note: Some VC-Turbo or heavily optioned trims may accommodate a slightly larger Group H6 (48).
• Cold Cranking Amps (CCA): 600 to 680 CCA (OEM specification usually sits around 600, but aftermarket upgrades offer up to 680+).
• Reserve Capacity (RC): 100 to 115 minutes.
• AGM vs. Flooded: Absorbed Glass Mat (AGM) is heavily required, especially if your Altima is equipped with the Auto Start-Stop feature.
• Terminal Layout: Standard SAE top post, Right Positive.
• Physical Dimensions (Group H5): Approximately 9.4 inches (Length) x 6.9 inches (Width) x 7.5 inches (Height).
• Dual-Battery Setup: Not applicable (standard passenger car, single battery).

Replacement battery options

If you are replacing the factory battery, investing in a high-quality aftermarket AGM battery will ensure longevity and reliable starts. Here are a few top-tier replacement options that fit the 2025 Altima:

• DieHard Platinum AGM (Group H5): A highly popular choice offering 680 CCA and excellent vibration resistance.
• Interstate MTX (MTX-47/H5): Interstate’s premium AGM line provides reliable power for modern electronics and a 36-month warranty.
• Optima YellowTop (DH5): Optima's DH5 direct-fit battery is a fantastic deep-cycle AGM option for Altimas running aftermarket audio or dash cams.
• ACDelco Gold AGM (47AGM): A reliable, OEM-grade replacement that provides excellent reserve capacity and long life.

AGM vs flooded — which does this vehicle need?

The 2025 Nissan Altima almost universally requires an AGM (Absorbed Glass Mat) battery, particularly if it is equipped with the Auto Start-Stop system. Standard flooded lead-acid batteries cannot handle the rapid cycling (frequent starting and stopping at red lights) and high parasitic draw of modern safety systems.

Installing a conventional flooded battery in an Altima designed for an AGM battery will result in premature battery failure—often within a year—and can cause glitches in the auto start-stop and infotainment systems. Always stick with AGM.

Post-installation relearn / reset procedure

Unlike some European vehicles that require complex dealership-level battery programming, the 2025 Nissan Altima is relatively straightforward, but it does have a Battery Management System (BMS) that requires attention.

1. BMS Reset: After installing the new battery, the Intelligent Battery Sensor (IBS) needs to recognize the new state of charge. This can often be done by a high-end scan tool. If you don't have a scanner, the vehicle will eventually relearn the new battery's internal resistance after a few days of driving, but auto start-stop might be temporarily disabled during this period.
2. Window Indexing: Roll the driver’s window all the way down and hold the switch for 3 seconds. Then, roll it all the way up and hold the switch for 3 seconds. Repeat for the passenger window to restore the auto up/down functionality.
3. Radio/Clock: You may need to reset the clock, though most modern Nissan infotainment units will automatically update via GPS or a connected smartphone.

Signs of a failing battery

Modern AGM batteries don't always give the classic "slow crank" warning before they die. Watch for these symptoms:

• The Auto Start-Stop system stops working (the car's computer disables it when battery voltage drops to preserve starting power).
• Flickering dashboard lights or infotainment screen reboots.
• A "Battery Charge System" warning message on the driver display.
• Key fob proximity sensor not recognizing the key consistently.
• Corrosion buildup on the battery terminals (though less common with AGM than flooded).

Common battery issues for this generation

The most common issue with late-model Altimas is owner-induced: installing a standard flooded battery instead of an AGM to save money. This inevitably leads to electrical gremlins, disabled safety features, and a dead battery just a few months down the road. Furthermore, parasitic drain from aftermarket accessories (like hardwired dash cams without low-voltage cutoffs) can severely degrade the battery life of the H5 battery.

If you don't feel comfortable swapping the battery and handling the electronic relearn yourself, don't risk damaging your Altima's sensitive modules.

Find a trusted shop on Repairius.