Honda CR-V Battery Size and Group Number Guide
Most Honda CR-Vs built from 1997 through 2019 use a Group 51R battery. Gas CR-Vs from 2020 onward use a larger Group H5 (also sold as Group 47) Enhanced Flooded Battery (EFB). The CR-V Hybrid uses its own Group 51 12-volt battery, which is a different part from the 51R. Mixing these up is an easy mistake, so check your model year and powertrain in the table below before you order.
This guide covers sizes, cold cranking amps, OEM part numbers, typical prices and a step-by-step replacement. If your CR-V won’t start and you’re not sure the battery is the culprit, start with our Honda CR-V dead battery guide first.
Honda CR-V Battery Group Size by Model Year
| Model Years | Powertrain | Group Size | Type | Notes |
|---|---|---|---|---|
| 1997–2001 | 2.0L gas | 51R | Flooded | 1st generation |
| 2002–2006 | 2.4L gas | 51R | Flooded | 2nd generation |
| 2007–2011 | 2.4L gas | 51R | Flooded | 3rd generation |
| 2012–2016 | 2.4L gas | 51R | Flooded | Canadian-market cars may use a larger Group 35 |
| 2017–2019 | 2.4L and 1.5L turbo | 51R | Flooded | Honda part 31500-SR1-100M, 500 CCA, all trims |
| 2020–2022 | 1.5L turbo gas | H5 (47) | EFB | Honda part 31500-TLA-EFB100M |
| 2020–2022 | 2.0L Hybrid | 51 | Flooded | Honda part 31500-SB2-100M, 500 CCA |
| 2023–2026 | 1.5L turbo gas | H5 (47) | EFB | Honda part 31500-TLA-EFB100M |
| 2023–2026 | 2.0L Hybrid | 51 | Flooded | Confirm against the label on your battery |
Part numbers and fitment come from Honda parts catalogs and major battery-maker lookups. Honda sometimes supersedes part numbers, and some vehicles list more than one battery configuration, so confirm against your owner’s manual, the label on the installed battery or a dealer VIN lookup.
51R vs 51 vs H5: What’s the Difference?
Group 51R
The 51R is a small, light battery used on many Honda and Acura models. The “R” means reversed terminals: the positive and negative posts are on opposite sides compared with a standard Group 51. Honda’s OEM 51R for the 2017–2019 CR-V is rated at 500 cold cranking amps (CCA). Typical aftermarket 51R batteries are rated at around 500 CCA too.
Group 51 (Hybrid)
The CR-V Hybrid’s 12-volt battery only has to boot the computers and close the high-voltage relays. The gasoline engine is started by the hybrid system’s electric motor, not by a conventional starter, so the 12-volt battery can be small. Honda’s catalog lists a Group 51 rated at 500 CCA. Because a 51 and a 51R are the same size with the posts swapped, a parts store can easily hand you the wrong one. The cables may not reach, or you could reverse the polarity, so check the post layout before you leave the counter. This is separate from the large high-voltage traction battery, covered in our CR-V Hybrid battery guide.
Group H5 / 47 EFB
From the 2020 model year, gas CR-Vs moved to an H5 (Group 47) Enhanced Flooded Battery. It is physically larger, about 9.5 x 6.9 x 7.5 inches, and an aftermarket EFB like the Interstate MTX-47/H5 is rated at 650 CCA. EFB construction is designed for the frequent restarts of an idle-stop system and the heavier electrical loads of a modern car. Replace it with an EFB of the correct group size, or with an AGM battery only if the battery maker lists it for your vehicle. A conventional flooded H5 is not a like-for-like replacement.
How Long Does a CR-V Battery Last?
Expect roughly three to five years from a CR-V 12-volt battery, depending on climate and driving habits. Heat is the biggest enemy. On many CR-Vs the battery sits close to the radiator, so cars in hot southern states often need a battery sooner than cars in mild climates. Short trips, long periods of sitting, dashcams that run while parked, and frequent remote starts also shorten its life.
Warning signs include slow cranking, dim lights at startup, an Auto Idle Stop system that stops engaging (on models that have it), warning lights for unrelated systems, or a battery older than four years that fails a load test. Our CR-V dashboard symbol guide explains the charging system light and related warnings.
Honda CR-V Battery Replacement Cost
Prices vary by brand, region and whether you install it yourself. These listed prices give a sense of the range at the time of writing:
- Genuine Honda 51R (31500-SR1-100M): about $113 from an online Honda parts dealer, before installation.
- Genuine Honda H5 EFB (31500-TLA-EFB100M): about $226 discounted, with an MSRP of about $327.
- Interstate MTX-47/H5 EFB: suggested retail of about $260.
Shop installation usually adds a modest labor charge, and many parts stores install for free when you buy the battery there. The job typically takes 30 to 60 minutes at a dealer, including testing. For how the battery fits into overall running costs, see our CR-V maintenance cost breakdown.
How to Replace a Honda CR-V Battery
On gas CR-Vs the battery sits in the engine bay. Replacing it is a straightforward driveway job that needs basic hand tools, gloves and eye protection.
- Confirm the correct replacement. Match group size, terminal layout (51 vs 51R) and battery type (EFB on 2020+ gas models) to the label on your old battery.
- Find your radio code if needed. Older CR-Vs may ask for an anti-theft radio code after power is restored. The code is usually on a card with the owner’s manual or available from a Honda dealer.
- Turn everything off. Switch off the vehicle and accessories, remove the key or keep the smart key away from the car, and open the hood.
- Disconnect the negative (–) terminal first. Loosen the clamp nut and lift the cable off the post. On newer CR-Vs a battery sensor is built into the negative clamp; disconnect at the clamp and leave the sensor attached to the cable.
- Disconnect the positive (+) terminal. Lift the red cover, loosen the clamp and move the cable aside so it cannot touch metal.
- Remove the hold-down bracket. Loosen the bracket bolts or rods, lift the bracket out and set it aside.
- Lift out the old battery. Keep it upright. An H5 battery weighs about 40 lb with packaging, so lift with your legs.
- Clean and install. Brush any corrosion off the cable clamps and tray, set the new battery in the same orientation, and refit the hold-down so the battery cannot move.
- Reconnect positive first, then negative. Tighten both clamps snugly and refit the terminal cover.
- Start and reset. Start the engine, enter the radio code if asked, and reset clock and presets. Idle quality and transmission shift feel may take a short drive to relearn.
- Recycle the old battery. Most parts stores take it back and may refund a core charge.
On the CR-V Hybrid, do not touch any orange high-voltage cables. Replace only the 12-volt battery, and follow the owner’s manual procedure for its location and disconnection.
Tips to Make Your Next Battery Last Longer
- Drive at least 20–30 minutes at a time regularly, so the alternator or hybrid system can fully recharge the battery.
- Use a battery maintainer if the CR-V sits for more than two weeks.
- Keep terminals clean and tight, and check that the hold-down is secure. Vibration kills batteries.
- Have the battery load-tested once a year after it turns three. Your Maintenance Minder service visits are a good time; see our CR-V maintenance schedule.
FAQ
Can I put a 51R battery in a 2020 or newer CR-V?
No, not on gas models. The 2020-and-later 1.5L turbo CR-V is designed for a larger H5 (Group 47) EFB, and the tray, hold-down and cables are sized for it. A 51R is smaller, has lower capacity and is not built for idle-stop cycling.
Is a Group 47 the same as H5?
Yes. H5 is the European (DIN) designation and Group 47 is the BCI equivalent. Batteries are often labeled “47/H5” or “H5/L2”.
Does the CR-V Hybrid have a regular 12-volt battery?
Yes. Besides the high-voltage traction battery, the hybrid has a conventional 12-volt battery that powers the electronics. If it dies, the car will not enter Ready mode even when the hybrid battery is charged. It can usually be jump-started using the procedure in your owner’s manual.
Can I upgrade my 51R CR-V to a larger battery?
Some owners fit an AGM 51R for longer life, which is a direct-fit upgrade. Canadian-market CR-Vs from around 2014 can use a larger Group 35, but fitting one to a US car may need a different hold-down. Stick to the group size your manual lists unless the battery maker confirms fitment.
The Bottom Line
For a 1997–2019 Honda CR-V, buy a Group 51R. For a 2020-or-later gas CR-V, buy an H5 (Group 47) EFB. For a CR-V Hybrid, buy a Group 51, not a 51R, and double-check the terminal layout. Confirm the exact spec in your owner’s manual or on the installed battery’s label before buying, and plan on a replacement every three to five years.
