The 1989 Honda CRX typically uses a Group 51R 12-volt battery. Some trims or regional variants may use Group 51 or other closely matched sizes, so always verify by checking the battery label or the owner's manual.
In automotive terms, the “size” refers to the battery group size, which defines the battery’s dimensions, terminal arrangement, and fitment in the engine bay, as well as its electrical capacity. The CRX from that era was a compact, light-weight car with modest electrical demand, so selecting the correct group size is important for reliable starts and electrical performance. This article explains how to confirm the exact size for your specific vehicle and how to replace it if needed.
Background: why the CRX uses a specific group size
Honda generally matched battery group sizes to the vehicle’s architecture, engine type, and climate requirements. For the late-1980s CRX, the most common match is a smaller, readily available group such as 51R, which fits the tray and delivers adequate cold-cranking amps for a 1.3–1.6 liter engine while keeping weight and space in check.
Common options and what they imply
Two group sizes you’re likely to encounter for this model are Group 51R and Group 51. The 51R uses a certain terminal layout; both are similar in overall footprint but may require different cable routing or terminal connectors. Confirm the exact group size on your battery or in the parts catalog for your VIN.
To confirm the exact size for your specific CRX, you can inspect the replacement part box, consult manuals, or use a parts lookup by VIN. The following steps help ensure you pick the correct size.
- Inspect the existing battery label: Look for the line that reads Group Size (for example, "Group 51R") along with CCA and Reserve Capacity.
- Consult the owner's manual or service manual: The recommended group size is listed for your model year and engine variant.
- Check the battery tray and terminal arrangement: Ensure the chosen battery fits the tray and aligns with cable connections; the 51R/51 family is common in this era.
- If you’re unsure, remove and take the battery or the exact measurements to a parts store for an in-person match: staff can confirm the correct group size and CCA rating.
Conclusion: By checking the battery label, manual, and fitment in the tray and with the cables, you can determine whether your 1989 CRX uses Group 51R or another nearby size. The 51R is the most common match for this model, but verify for your specific vehicle configuration.
How to source and replace the correct battery
Once you know the correct group size, you can shop for a replacement with compatible CCA and capacity to match your climate and usage patterns.
Summary
The 1989 Honda CRX generally uses a Group 51R 12-volt battery, though some configurations may use Group 51. Always verify with the label or manual to ensure the right fit and performance. If you’re uncertain, reference the VIN or consult a parts specialist to confirm the exact group size for your car.