2020 Honda Civic Battery Size & Group
A complete guide to BCI group size, CCA, and the best replacement batteries for your 2020 Civic.
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick answer
- BCI Group Size: Group 47 (also known as H5 or L2)
- Cold Cranking Amps (CCA): 410-500 CCA
- Reserve Capacity (RC): 70-90 minutes
- Battery Type: Flooded Lead Acid (standard); AGM is an optional upgrade
- Terminal Layout: Left-hand positive (+)
- Physical Dimensions (approximate): 9.68" L x 6.88" W x 7.5" H (246 x 175 x 190 mm)
Replacement battery options
- Interstate: MT-47/H5
- ACDelco: 47AGM
- DieHard: Platinum AGM Battery, Group Size H5, 680 CCA
- Optima: YELLOWTOP DH5, Group 47
AGM vs flooded — which does this vehicle need?
The 2020 Honda Civic comes standard with a conventional flooded lead-acid battery. This is a reliable and cost-effective choice for most owners. However, an Absorbed Glass Mat (AGM) battery is a worthwhile upgrade, especially if you live in a cold climate or use a lot of electronic accessories (dash cam, aftermarket stereo, etc.). AGM batteries offer better cold-weather starting power, are more resistant to vibration, and are spill-proof. They also tend to last longer than flooded batteries.
Post-installation relearn / reset procedure
After replacing the battery in your 2020 Honda Civic, you may need to perform a few relearn procedures. The most common is the power window reset. To do this, simply roll each window down all the way, then up all the way, holding the switch for a few seconds in each direction. You may also need to re-enter your radio presets. In some cases, the engine idle may be erratic for a short time as the computer relearns its settings. This will usually resolve itself after a few minutes of driving.
Signs of a failing battery
- Slow engine crank: This is the most common sign of a weak battery. The engine will turn over more slowly than usual, especially on cold mornings.
- Dimming lights: If your headlights or interior lights dim when you start the car, it's a sign the battery is struggling to provide enough power.
- Warning light: The battery warning light on your dashboard may illuminate if the charging system is not working properly.
- Corrosion on the terminals: White or blue powder on the battery terminals can indicate a leak and a failing battery.
Common battery issues for this generation
The 10th generation Honda Civic (2016-2021) is generally a reliable car, but there are a few common battery-related issues to be aware of. Some owners have reported premature battery failure, especially in hot climates. This can be exacerbated by the car's auto-stop/start feature, which puts extra strain on the battery. If you frequently make short trips, the battery may not have enough time to fully recharge, which can shorten its lifespan. Using a battery tender can help to mitigate this issue.
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More specs for the 2020 Honda Civic
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
2020 Honda Civic 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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