What size battery is in a 2007 Honda Fit?

The 2007 Honda Fit uses a 12-volt BCI Group Size 151R battery (often also sold as 51R/151R), typically around 35–45 Ah with 370–500 cold-cranking amps (CCA), and measuring roughly 9.4 x 5.1 x 8.9 inches. In practice, most parts retailers list 151R as the direct fit, and many brands label the same fitment as 51R—just ensure the “R” (reverse terminal) orientation matches your car’s wiring.

Factory specification and key details

Honda equipped the first-generation U.S.-market Fit (model year 2007) with a compact, right-post (reverse) terminal battery to suit the small engine bay and OE hold-down. The commonly accepted fitment in North America is BCI Group 151R, which aligns with the tray and cable reach without modification.

• Battery group: BCI 151R (often cross-listed as 51R/151R by some brands)
• Terminal orientation: “R” (reverse) — positive post on the right when terminals face you
• Nominal voltage: 12 V
• Typical CCA range: 370–500 CCA (higher is better for cold climates)
• Approximate size: 9.4 in L × 5.1 in W × 8.9 in H (about 240 × 129 × 225 mm)
• Typical capacity: ~35–45 Ah; reserve capacity often ~60–85 minutes (varies by brand)

These specifications reflect the common aftermarket offerings that match OE dimensions and electrical needs for reliable cranking and proper fit under the stock hold-down.

Interchangeability and alternatives

While 151R is the standard listing for the 2007 Fit, some manufacturers and retailers use 51R to denote the same overall footprint and reverse terminal layout. The crucial factors are physical fit, terminal orientation, and hold-down compatibility. Upgrading within the same group to a higher-CCA unit can improve cold-weather starting performance.

• 51R-labeled batteries: Many are dimensionally equivalent to 151R and will fit if the “R” orientation is correct.
• AGM option (151R/51R): Absorbent Glass Mat versions in the same group size offer better vibration resistance and lower self-discharge.
• Avoid larger groups (e.g., 47/H5, 24F) unless you plan tray/hold-down modifications; cable reach and clearance can be issues.

If you choose a non-standard option, verify height and clamp style, and ensure the positive cable reaches without strain and the hood clears the posts and terminals.

How to confirm the correct battery on your car

Though 151R is the common fitment, it’s wise to confirm on your specific vehicle to avoid returns and ensure proper installation.

1. Check the owner’s manual under “Battery” or “Specifications” for the listed group size and terminal orientation.
2. Read the label on your current battery for group size (e.g., 151R/51R), CCA, and dimensions.
3. Measure the tray and hold-down: length, width, and height clearance under the hood.
4. Verify terminal layout: with terminals facing you, the positive should be on the right (“R”).
5. Match climate needs: choose higher CCA for cold regions; standard CCA is fine for mild climates.

Taking a minute to validate these points ensures a straightforward install and reduces the risk of fitment surprises.

Installation and maintenance tips

A correct fit is only part of the equation—good installation practices will extend battery life and improve reliability.

• Use a memory saver if you want to preserve radio presets and ECU adaptations during the swap.
• Clean terminals and apply a light anti-corrosion protectant; ensure a snug, not overtight, clamp fit.
• Secure the hold-down evenly to prevent vibration damage; do not over-tighten.
• If upgrading to AGM, use a compatible charger for maintenance charging and avoid overvoltage.
• Periodically check resting voltage (12.6–12.8 V healthy) and charging voltage (about 13.7–14.7 V engine running).

Proper installation and occasional checks help maximize service life, especially if the vehicle sees short-trip usage that can undercharge the battery.

Summary

The 2007 Honda Fit takes a 12-volt BCI Group 151R battery with reverse terminals; many brands label this fitment as 51R/151R. Expect approximate dimensions of 9.4 x 5.1 x 8.9 inches and typical 370–500 CCA. Confirm the “R” orientation, tray clearance, and hold-down height, and consider a higher-CCA unit (or AGM) if you drive in colder climates.

What kind of battery does a 2007 Honda Fit key take?

CR1616 3V
Compatible with a 2007-2013 Honda Fit Keyless Remote with a low or dead battery. Includes two (2) BatteryGuru CR1616 3V car key batteries.

What group size battery fits my car?

Check the Owner’s Manual: The battery section of your car’s manual will list the recommended BCI Group Size and minimum CCA. Look at the Existing Battery: The current battery’s Group Size is often labeled on the top label or front of the battery. Be sure to verify that it meets your vehicle’s requirements.

What is the difference between a 35 and 51R battery?

Groups 35 and 51R
The Group-51 Battery is found in Hondas, Nissan GTRs, and some other Japanese Cars. It can actually be used as a smaller/lighter version of the Group-35 for racing being it is same height and length, just narrower front to back.

What size battery does a Honda Fit use?

The most common battery size for a Honda Fit is Group Size 151R, though some models may use a 51R battery, especially for performance or aftermarket applications. Always verify the specific group size and other specifications like cranking amps for your vehicle’s exact year and model by using a fitment tool on an auto parts store’s website or consulting your owner’s manual. 
Key points for choosing a Honda Fit battery:

• Group Size: The standard size is typically 151R. 
• Confirm Specifications: Use a battery fitment tool on a store’s website by entering your Honda Fit’s year, make, and model to find the correct battery. 
• Cranking Amps (CCA): Match or exceed the CCA of your old battery for reliable starting power. 
• “R” in the Size: The “R” in 151R or 51R indicates that the battery has reverse terminals.