What size battery does a 2010 Honda Rancher 420 use?

The correct battery size for a 2010 Honda Rancher 420 (TRX420 series) is the compact AGM “ZS-case” format: Yuasa YTZ12S on most trims, with many EPS (power steering) and AT/IRS models using or benefiting from the higher-CCA YTZ14S. Both are 12V sealed AGM batteries with identical dimensions (about 150 mm L × 87 mm W × 110 mm H), so the YTZ14S is a direct-fit upgrade that provides a bit more cranking power. Below is a detailed breakdown to help you confirm the right choice for your specific sub-model and riding needs.

Fitment by trim and usage

Honda offered several TRX420 variants in 2010 (2×4, 4×4, ES, EPS, AT/IRS). While the battery bay is sized for the “ZS” case, the exact recommendation can vary slightly by trim and accessories. Here’s a general guide most owners and parts catalogs follow.

• TRX420TM/TE/FM/FE (non-EPS, non-AT): YTZ12S (12V AGM, ~11Ah, ~210 CCA) is typically specified.
• TRX420 models with EPS and/or AT/IRS: YTZ14S (12V AGM, ~11.2Ah, ~230 CCA) is commonly specified or recommended for additional cranking demand.
• Direct-fit upgrade path: YTZ14S fits any YTZ12S slot (same size), offering higher CCA for cold starts, winches, plows, and accessories.

Because sub-model equipment can differ, confirm your exact trim (and any added electrical loads) before purchase. If in doubt, the YTZ14S is a safe, direct-fit choice for more starting headroom.

Key specifications to match

Regardless of brand, matching these core specs ensures drop-in compatibility and reliable starting performance on the Rancher 420.

• Case size: “ZS” format — approximately 150 mm (L) × 87 mm (W) × 110 mm (H).
• Voltage: 12V sealed AGM (maintenance-free, factory-activated or fill-and-seal depending on brand).
• Capacity/CCA: YTZ12S ~11Ah, ~210 CCA; YTZ14S ~11.2Ah, ~230 CCA.
• Terminal orientation: With the terminals facing you, positive is on the left, negative on the right (standard for YTZ12S/YTZ14S).
• Charging: Use a powersports smart charger at ~1–2 amps; avoid high-amp automotive chargers.

Keeping to these dimensions, polarity, and chemistry avoids fitment issues and ensures adequate cranking performance for the 420’s single-cylinder EFI engine.

Interchangeable part numbers and equivalents

Many aftermarket batteries mirror Yuasa’s code. If you choose a non-Yuasa brand, look for direct cross-references to the YTZ12S/YTZ14S to ensure the correct case size and terminal layout.

• Yuasa: YTZ12S, YTZ14S (OEM-style fit).
• Common aftermarket codes: CTZ12S/CTZ14S, BTZ12S/BTZ14S, PTZ12S/PTZ14S (brand prefix varies, “TZ12S/TZ14S” is the key).
• Avoid: YTX14-BS or ETX14 styles — they are taller (about 145 mm) and generally will not fit the Rancher 420 battery bay.

If shopping online, verify the listed dimensions and polarity diagram against the “ZS” spec to prevent receiving the taller, non-fitting case size.

How to verify before buying

A quick check can prevent wrong-fit returns and downtime, especially with trim variations and previous owner changes.

1. Check your owner’s manual for the specified battery code (often YTZ12S or YTZ14S).
2. Measure your battery box or current battery (expect ~150 × 87 × 110 mm).
3. Confirm terminal orientation: positive left, negative right when facing the posts.
4. Consider your load: winch, plow, or frequent cold starts favor the YTZ14S.
5. If uncertain, provide your VIN to a Honda dealer or trusted parts supplier for exact sub-model fitment.

These checks ensure you match both the physical fit and the electrical demands of your specific Rancher setup.

Installation and care tips

Proper prep and upkeep will maximize battery life, especially in seasonal or harsh-use conditions common to ATVs.

• Pre-charge to 100% with a smart charger at 1–2A before first start.
• Clean and tighten terminals; apply dielectric grease to reduce corrosion.
• Secure the hold-down strap so the battery can’t vibrate or shift off-trail.
• Use a maintenance tender during storage; disconnect accessories when not in use.
• Avoid deep discharges; AGM batteries last longer when kept fully charged.

Following these steps helps avoid no-start issues and extends the lifespan of AGM powersports batteries.

Summary

The 2010 Honda Rancher 420 uses the compact AGM “ZS” battery size. Most trims take a YTZ12S, while EPS/AT or accessory-heavy setups often specify or benefit from the higher-CCA YTZ14S. Both are 12V, sealed, and share the same dimensions (about 150 × 87 × 110 mm) with positive terminal on the left. When in doubt, the YTZ14S is a direct-fit option that offers stronger cranking performance without any modification.

What battery for Honda Rancher 420?

𝐑𝐄𝐋𝐈𝐀𝐁𝐋𝐄 𝐀𝐓𝐕 𝐁𝐀𝐓𝐓𝐄𝐑𝐘 𝐅𝐎𝐑 𝐂𝐎𝐍𝐒𝐈𝐒𝐓𝐄𝐍𝐓 𝐏𝐄𝐑𝐅𝐎𝐑𝐌𝐀𝐍𝐂𝐄 – Built for durability and power, this YTX14-BS battery delivers long-lasting performance for outdoor adventures and farm work. Engineered to be compatible with Honda Rancher 420 battery, it ensures dependable starts and sustained energy for every ride.

What size battery do I need for my ATV?

ATV batteries are typically 12-volt and are often the same as powersport or motorcycle batteries. Common sizes include YTX14-BS, YTX4L-BS, and YTX7A-BS. The best battery size for your ATV depends on your specific model, but you can find the correct size by checking your owner’s manual or the battery compartment. 
Key Considerations for ATV Batteries:

• Voltage: Most ATVs use a 12-volt battery. 
• Capacity (Ampere-hours, Ah): Indicates how long the battery can supply power. Larger engines may require higher Ah batteries. 
• Cold Cranking Amps (CCA): Indicates the battery’s ability to start the engine in cold weather. Higher CCA is better for colder climates. 
• Battery Type: AGM (Absorbent Glass Mat) batteries are common for ATVs due to their vibration resistance and ability to be mounted in various positions. 
• Dimensions: Always verify that the physical dimensions of the battery are compatible with your ATV’s battery compartment. 
• Terminal Type: Ensure the battery terminals match your ATV’s wiring harness. 

How to Determine the Correct Battery Size:

1. 1. Consult your ATV’s owner’s manual: . Opens in new tabThis is the best place to find the manufacturer’s recommended battery size and specifications. 
2. 2. Check the existing battery: . Opens in new tabIf the battery is still accessible, note the model number (e.g., YTX14-BS) and replace it with the same type. 
3. 3. Measure the battery compartment: . Opens in new tabIf you can’t find the model number, measure the length, width, and height of the battery compartment to ensure the new battery will fit. 
4. 4. Consider your climate: . Opens in new tabIf you ride in cold weather, a higher CCA battery may be necessary. 

What is the battery voltage for a Honda Rancher 420?

12 Volt
12 Volt, 16 Amp Ultra Premium AGM Sealed Maintenance Free Battery.

How many CCA does a Honda ATV need?

The correct CCA rating for your ATV will depend largely on the climate that you’re using it in. In general though, a battery with 500 CCA or more should have no problem starting an ATV engine even when the temperature drops below zero.