2021 Volvo VNL Battery Size, CCA, and Replacement Guide
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Quick Answer
- BCI Group Size: Group 31 (typically three or four batteries)
- CCA Rating: 925-1000 CCA per battery (minimum)
- Reserve Capacity: 180-200 minutes per battery (minimum)
- AGM vs. Flooded: Flooded lead-acid is standard, but AGM is an excellent upgrade for improved durability and cycling ability.
- Terminal Layout: Typically SAE post, top terminal.
- Physical Dimensions (Group 31): Approximately 13" L x 6.8" W x 9.4" H
- Dual/Multi-Battery Setup: The 2021 Volvo VNL utilizes a multi-battery setup, commonly three or four Group 31 batteries, wired in parallel to provide sufficient cranking power and reserve capacity for the heavy-duty diesel engine and extensive electrical demands.
Replacement Battery Options
Identifying specific part numbers for heavy-duty truck batteries can vary widely by manufacturer and specific battery line. However, here are popular options by brand for Group 31 batteries suitable for your 2021 Volvo VNL:
- Interstate: Look for their "Mega-Tron Plus" or "Workaholic" series. Common part numbers might be 31P-MHD, 31P-HD, or similar variations. Verify CCA and RC ratings.
- Optima: Optima primarily focuses on AGM technology. Their YellowTop or BlueTop (deep cycle/starting) Group 31 options are excellent upgrades. Part numbers would typically be D31T (YellowTop with top and side posts) or similar for a heavy-duty Group 31.
- DieHard: DieHard offers various Group 31 batteries. Their Platinum (AGM) or Gold series are good choices. Specific part numbers will vary by retailer.
- Odyssey: Odyssey PC2150 (AGM) is a popular and very robust Group 31 battery, known for its high CCA and deep cycling capabilities. This is a premium option.
- ACDelco: ACDelco offers heavy-duty Group 31 batteries. Look for their "Advantage" or "Professional" series. Part numbers might be 31PHD, 31SHD, or similar.
Always double-check the CCA and Reserve Capacity specifications to ensure they meet or exceed Volvo
More specs for the 2021 Volvo VNL
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 Volvo VNL 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-26.