2003-2007 Honda Accord Battery Size
4-cyl 2.4L: 51R; V6 3.0L: 70D23L-MF. Source: Honda's genuine-parts catalog (Honda part numbers in the table). Confirm against the label on the battery in your car before ordering.
Battery finder
Select your Accord year and engine. Each size is the replacement battery Honda's parts catalog lists for it (part numbers in the chart below); confirm against the label on your battery before buying.
Group 51R has reversed terminals; a plain 51 will not connect the same way.
See recommended batteriesOn a 2003-2007 Accord with the 2.4-liter four-cylinder, Honda's parts catalog lists a Group 51R battery, part number 31500-SR1-100M. Pay attention to that R. A 51 and a 51R are mirror images of each other, with the terminals on opposite sides, and they are not interchangeable even though they share a case size. The 3.0-liter V6 is listed differently. Honda calls for a 70D23L-MF battery, part 31500-SL5-100M, and 70D23L is a Japanese JIS case code rather than a BCI group number like 51R. Honda lists that same 70D23L battery for the 2005-2007 Accord Hybrid. Since Honda's current part can differ from what the factory installed, read the label on the battery in your car before you buy.
| Engine / trim | Group size | CCA | Type | Honda part no. | Notes | Shop |
|---|---|---|---|---|---|---|
| 4-cyl 2.4L | 51R | Not listed | Not listed | 31500-SR1-100M “Battery (51R/500Amp85)” | Group 51R has reversed terminals; a plain 51 will not connect the same way. | Shop ▸ |
| V6 3.0L | 70D23L-MF | Not listed | Not listed | 31500-SL5-100M “Battery Assembly (70D23L-MF)” | 70D23L is a Japanese (JIS) case code, not a BCI group. Honda lists the same battery for the 2005-2007 Accord Hybrid. | Shop ▸ |
What to check before buying
- Group size: this controls physical fit, hold-down, and terminal position.
- Terminal direction: 51R has reversed terminals; 51 and 51R are not interchangeable.
- CCA: match or exceed the rating on your current battery in the same group size.
- Type: match the type printed on your current battery (flooded, EFB or AGM).