2019 Honda Pilot — Battery Size & Group (Specs, CCA, RC)

Quick answer

• BCI group size: 24F (JIS “reverse” layout)
• Cold cranking amps (CCA): 600–730 CCA recommended; minimum ~550 CCA. Idle Stop (start/stop) trims: choose 700+ CCA.
• Reserve capacity (RC): typically 120–140 minutes for quality 24F batteries.
• Battery type: Flooded 24F on non–Idle Stop trims; AGM (or EFB) 24F required/recommended on Idle Stop (Touring/Elite) trims. AGM is the best all-around upgrade.
• Terminal layout: Top-post, positive terminal on the left when posts are closest to you (24F reverse polarity).
• Physical dimensions (24F): about 10.3" L × 6.8" W × 8.9" H (260 × 173 × 225 mm).
• Dual-battery setup (diesel?): Not applicable — the 2019 Pilot is gasoline only and uses a single 12‑V battery.

Replacement battery options

Note: Use Group 24F for direct fit. Choose AGM for models with Idle Stop; flooded is acceptable on non–Idle Stop trims. Avoid downgrading from AGM/EFB to standard flooded on start/stop models.

• Interstate MT-24F (flooded) — Direct-fit for non–Idle Stop trims; solid value and OE-like performance.
• Interstate MTX-24F (AGM) — Designed for start/stop service; excellent for Touring/Elite trims or heavy accessory use.
• DieHard Platinum AGM — Group Size 24F. Premium AGM for start/stop, high CCA and RC.
• DieHard Gold — Group Size 24F. Quality flooded option for non–Idle Stop Pilots.
• Odyssey Performance Series — Group 24F AGM. High reserve capacity and strong cycling durability.
• ACDelco Gold — Group 24F. Reliable flooded replacement; AGM variant also available in 24F from select retailers.

(Only list exact part numbers you can verify; if in doubt, shop by vehicle and confirm start/stop compatibility.)

AGM vs flooded — which does this vehicle need?

• Non–Idle Stop trims (LX, EX, many EX-L): These were typically equipped with a flooded Group 24F from the factory. A quality flooded 24F with at least ~600 CCA works, though upgrading to AGM improves durability if you make short trips or run accessories with the engine off.
• Idle Stop trims (Touring, Elite): These use an Idle Stop system that cycles the battery frequently. Use an AGM (or OE-spec EFB) Group 24F designed for start/stop. Do not downgrade to a standard flooded battery; it will wear out quickly and can cause system faults.

Tip: If your Pilot originally came with an AGM/EFB, replace it with AGM to maintain performance and system health. Always match or exceed the OE CCA and RC ratings.

Post-installation relearn / reset procedure

After reconnecting the battery, several Honda systems perform self-learns. To minimize issues:

1. Protect the battery sensor: The negative cable has a battery current sensor. Do not pry on it; disconnect/reconnect gently.

2. Idle learn (PCM):

• Make sure all accessories are off (HVAC, lights, audio).
• Start the engine and let it idle until fully warm (radiator fan cycles on), then continue to idle for about 5 minutes with no loads. This allows the PCM to relearn idle control.

3. Power window/mirror/sunroof initialization (as equipped): For each window, key ON, hold the switch to fully lower; keep holding 2 seconds. Then raise fully; hold 2 seconds. Repeat for all doors. Perform a similar open/close-and-hold cycle for the moonroof.

4. Radio/clock presets: Re-enter presets and time. 2019 models typically do not require an anti-theft code, but you may need to accept prompts on the display.

5. Battery Management System (BMS) reset: Ideally use a scan tool capable of the Honda “battery reset”/sensor calibration when installing a new battery, especially on Idle Stop trims. If a scan tool isn’t available, the system will relearn state-of-charge over several drive cycles; plan a 10–20 minute mixed-speed drive with minimal loads. Any temporary warnings (Idle Stop, VSA/i‑VTM4) usually clear on their own after a short drive.

Signs of a failing battery

• Slow cranking, especially after an overnight sit or in cold weather
• Dim interior or dash lights at idle; flickering infotainment on startup
• Intermittent auto Idle Stop disabled message
• Corrosion around the positive terminal or acid smell
• Battery case swelling, low electrolyte in flooded batteries
• Measured resting voltage below ~12.4 V after sitting, or failing a load test

Common battery issues for this generation

• Short-trip driving plus Honda’s charge strategy can leave the battery undercharged, promoting sulfation. Using an AGM on start/stop trims and periodically charging with a smart maintainer helps.
• Battery current sensor faults (on the negative cable) can cause charging and start/stop warnings. Inspect sensor connections when replacing the battery.
• Infotainment or accessory modules occasionally remain awake, creating a parasitic draw that flattens the battery over a few days. A professional parasitic draw test can pinpoint the cause.
• Premature wear when a start/stop vehicle is fitted with a standard flooded battery. Always use AGM/EFB for Idle Stop trims.

If you’re unsure which trim you have or whether you need AGM, check the under-hood battery label and owner’s manual, or consult a qualified shop.

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