If your Honda Accord cranks slowly or refuses to start, the 12-volt battery is the first thing to check. Most Accords use the compact Group 51R battery, the same small case size found in the Civic. Here is the group size, cost, and how to replace it.
| Model / Years | Group size | Typical CCA | Part cost |
|---|---|---|---|
| Accord 2013-2025 | Group 51R | 400-500 CCA | $130-$220 |
| Accord 2008-2012 | Group 51R | 410-500 CCA | $130-$210 |
| Accord Hybrid 12V aux | Group 51R | 400-500 CCA | $140-$230 |
The Honda Accord uses a Group 51R battery across most model years. The R indicates the reversed terminal position, so buy the 51R version specifically. Some V6 and older Accords may fit a larger case, so measure the tray if you are unsure.
Around 400 to 500 cold cranking amps is appropriate for the Accord's starter and electrical load.
A Group 51R battery usually costs about 130 to 220 dollars for the part. With installation at a shop, budget roughly 180 to 300 dollars. Parts stores often install this accessible battery at no charge.
Turn the car off. Disconnect the negative terminal first, then the positive. Remove the hold-down clamp, lift out the old battery, and set the new one in the same position.
Reconnect positive first, then negative, tighten the clamp, and reset the clock and radio presets. Re-initialize the windows if they stop working with one touch.
Look for slow or labored cranking, dim headlights at idle, a clicking sound at the key, and battery or charging warning lights. A battery four or more years old with these symptoms should be tested and likely replaced.
The 50 most common check engine codes with likely cause and DIY fix cost. Sent once.