2021 Nissan Altima Battery Size & Specs
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Quick answer
- BCI Group Size: Group 47/H5
- Cold Cranking Amps (CCA): 600-650 CCA
- Reserve Capacity (RC): 90-100 minutes
- AGM vs Flooded: AGM is highly recommended
- Terminal Layout: Left-hand positive
- Physical Dimensions: 9.68" L x 6.88" W x 7.5" H
Replacement battery options
- Interstate: MTX-47/H5
- DieHard: Platinum AGM 47/H5
- ACDelco: 47AGM
- Optima: H6 YellowTop (requires tray spacer)
AGM vs flooded — which does this vehicle need?
The 2021 Nissan Altima comes factory-equipped with an Enhanced Flooded Battery (EFB), which is a step up from a traditional flooded battery but not quite a full AGM. However, given the Altima's extensive electronics and stop-start technology, an AGM (Absorbent Glass Mat) battery is the recommended replacement. AGM batteries offer better cold-weather performance, deeper cycling capability, and greater vibration resistance than both flooded and EFB types.
Post-installation relearn / reset procedure
After replacing the battery in your 2021 Altima, you may need to perform a few relearn procedures:
- Idle Air Volume Learning: This procedure allows the engine control module (ECM) to learn the optimal idle airflow. It typically involves a specific sequence of key-on, key-off, and accelerator pedal positions. Consult a service manual or a professional technician for the exact steps.
- Power Window Reset: You may need to reset the auto up/down function for the power windows. This is usually done by rolling each window all the way down and then all the way up, holding the switch for a few seconds in each direction.
Signs of a failing battery
- Slow engine crank: The engine turns over sluggishly when you try to start it.
- Dimming lights: Headlights and interior lights may dim, especially at idle.
- Warning lights: A battery or charging system warning light may illuminate on the dashboard.
- Swollen battery case: The battery case appears bloated or misshapen, which can be a sign of internal damage.
Common battery issues for this generation
The 2019-present generation of the Nissan Altima is known for its reliance on advanced electronics, which can put a significant strain on the battery. Premature battery failure is not uncommon, especially if the vehicle is frequently driven in extreme temperatures or for short trips. The factory-installed EFB batteries may not have the longevity of a true AGM battery, making an AGM upgrade a wise investment.
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More specs for the 2021 Nissan Altima
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 Nissan Altima Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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