2018 Honda Odyssey Battery Size & Group
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Quick answer
- BCI Group Size: H6 / Group 48
- Cold Cranking Amps (CCA): 760 CCA
- Reserve Capacity: 120 minutes
- AGM vs. Flooded: AGM required
- Terminal Layout: Top Post
- Physical Dimensions: 12.1" L x 6.9" W x 7.5" H
Replacement battery options
- Interstate: MTX-48/H6
- Optima: DH6 YellowTop
- DieHard: Platinum AGM H6
- Odyssey: ODP-AGM48 H6 L3
- ACDelco: 48AGM
AGM vs flooded — which does this vehicle need?
The 2018 Honda Odyssey requires an absorbed glass mat (AGM) battery. This is due to the increased electrical demands of the vehicle. The Odyssey is equipped with a start-stop system that automatically shuts the engine off when the vehicle is stopped to improve fuel economy. This system puts a much greater strain on the battery than a traditional starting system. AGM batteries are better able to handle the frequent deep discharges associated with start-stop systems. They also have a lower internal resistance, which allows them to be recharged more quickly.
Post-installation relearn / reset procedure
After replacing the battery in a 2018 Honda Odyssey, you will need to perform a relearn procedure to ensure that all of the vehicle's systems are functioning properly. This includes resetting the radio and navigation system, as well as the power windows and sunroof. The specific procedure will vary depending on the trim level of your Odyssey, but it typically involves the following steps:
- Turn the ignition to the ON position.
- Press and hold the radio power button for two seconds.
- Enter the five-digit radio code. This code can be found on a sticker in the glove box or in the owner's manual.
- Press and hold the power window switches until the windows are all closed.
- Press and hold the sunroof switch until the sunroof is closed.
Signs of a failing battery
- The engine cranks slowly or not at all.
- The headlights are dim.
- The battery warning light is on.
- The battery is more than three years old.
Common battery issues for this generation
The most common battery issue for the 2018 Honda Odyssey is premature battery failure. This is often caused by the increased electrical demands of the vehicle, as well as the fact that many Odysseys are driven for short trips, which does not allow the battery to fully recharge. Another common issue is a loose or corroded battery terminal. This can cause a variety of electrical problems, including a no-start condition.
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More specs for the 2018 Honda Odyssey
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
2018 Honda Odyssey 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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