The 2005 Honda Foreman 500 uses a standard 12‑volt motorcycle‑style battery, typically in the 8–9 amp‑hour range. The exact fit can vary a bit by market and production batch, but all models from that year use a compact, 12V unit located under the seat.
In more detail, the Foreman 500’s battery is a sealed lead‑acid, 12‑volt power source designed to crank the engine and run accessories. Replacements should match or exceed the original capacity and have compatible terminal layout and dimensions to ensure proper mounting and electrical connections.
Battery type and capacity
The Foreman 500’s battery is a 12V lead‑acid unit. Typical capacity for this ATV sits around 8–9 ampere‑hours (Ah), with cold‑cranking amps (CCA) generally in the 150–180 A range depending on the exact batch and supplier. When shopping for a replacement, you’ll want a battery labeled 12V with similar or higher Ah and CCA ratings and the same terminal configuration.
The following list outlines common replacement options that fit or suit the Foreman 500’s specifications. Use this as a guide, but verify fitment before purchasing.
- YTX9‑BS (12V, about 9Ah) — a popular compact option for mid‑sized ATVs and motorcycles.
- YTX12‑BS (12V, about 11–12Ah) — larger capacity option that still fits many ATV compartments.
- AGM or flooded 12V batteries with matching dimensions and terminal layout — suitable substitutes if they meet the 12V rating and similar Ah/CCA.
In all cases, confirm the battery’s physical dimensions and terminal arrangement to ensure a proper fit in the Foreman’s under‑seat tray and harnessing.
How to verify the correct fit
Before buying a replacement, verify the fit by checking the OEM specifications and measuring the battery bay. Take note of the original part number, exact dimensions, terminal positions, and the required voltage and capacity. If in doubt, consult a Honda dealer or an ATV parts retailer with your bike’s VIN to confirm the correct size.
- Check the original specification label on the current battery or the owner’s manual for voltage (12V), capacity (Ah), and CCA.
- Measure length, width, and height of the battery compartment to ensure the replacement fits without rubbing or interfering with components.
- Ensure terminal layout (positive/negative) matches your harness and that the battery terminals are oriented correctly for easy connection.
Choosing a reputable brand and opting for AGM (absorbed glass mat) technology can offer better vibration resistance and longer life in rough ATV conditions, though a high‑quality flooded lead‑acid battery can also perform well if properly maintained.
Summary: For a 2005 Honda Foreman 500, you’re looking at a 12‑volt battery with roughly 8–9Ah capacity, compatible with common 12V replacement options like YTX9‑BS or YTX12‑BS, among others. Always verify the exact fit by consulting the manual, checking the OEM part number, and confirming dimensions and terminal layout before purchasing. A correctly sized, quality battery ensures reliable starting and power for the ATV’s accessories.