The 2018 Honda Ridgeline uses a standard 12-volt automotive battery, typically sized as Group 51R.
The exact battery size and specifications can vary slightly by vehicle, so it’s important to verify the label on your current battery or consult the owner's manual to ensure you replace it with the correct Group size and ratings. This article explains what to expect, how to confirm the exact size, and what to consider when replacing the battery on a Ridgeline from that model year.
Battery type and what “Group 51R” means
How to confirm the exact size on your Ridgeline
To be certain you buy the right battery, check the label on the current battery in your engine bay. The label will list the group size (for example, 51R), along with the CCA, RC, and part number. If the label is missing or unreadable, consult your vehicle’s owner’s manual or contact a Honda dealer with your VIN for the exact factory specification.
You can also verify the spec at an auto parts retailer by entering the year, make, model, and engine size, which will pull up the OEM-recommended group size for that specific vehicle.
Replacement considerations
Practical replacement steps
Before replacing the battery, make sure you have the right tools and observe safety precautions. The following steps outline a standard replacement procedure for a Ridgeline’s 12-volt battery:
- Park on a level surface, engage the parking brake, and turn off the ignition and all electrical accessories.
- Disconnect the negative terminal first, then the positive terminal, using appropriate wrenches to avoid short circuits.
- Remove the battery hold-down clamp, take out the old battery, and inspect the tray for corrosion or damage.
- Clean the tray if needed, position the new battery in the tray, and secure the hold-down clamp.
- Connect the positive terminal first, then the negative terminal, and tighten the clamps to the specified torque.
- Start the engine to ensure everything runs properly and reset any electronic systems if required by your vehicle.
Dispose of the old battery properly at a recycling center or an auto parts store that offers battery recycling, as this protects the environment and may earn you a small discount on a new battery.
Summary
The 2018 Honda Ridgeline typically houses a 12-volt automotive battery in Group 51R size, though exact specifications can vary by vehicle. Always verify the group size, CCA, and RC on the current battery label or in the owner’s manual, and replace with a battery that meets or exceeds the OEM ratings while fitting the battery tray and terminal layout. Proper replacement and disposal help ensure reliable starts and long battery life.