Stihl RMA 510 21in Walk Behind Battery Powered Mower, Unit Only - STI-RMA510UNIT

Stihl RMA 510 21in Walk Behind Battery Powered Mower, Unit Only - STI-RMA510UNIT

The STIHL RMA 510 is a Walk Behind Mower Residential unit designed to deliver high performance and convenience for homeowners. This battery-powered lawn mower features a 21in steel mowing deck with a 20in cutting width, allowing you to cover more lawn area faster than previous models. It offers instant starting, less noise, zero gasoline costs, and zero exhaust emissions, making it an environmentally friendly option.

The RMA 510 is equipped with an adjustable handlebar, a grass catcher, and larger rear wheels for easy maneuverability over rough terrain. The mower also includes a holding slot for a second battery, enabling quick battery swaps to extend your mowing time.  Battery and charger not included.

Features

• Instant Starting and Low Noise: Enjoy the convenience of instant startup and reduced noise levels compared to traditional gasoline-powered mowers.
• Zero Emissions: This mower produces zero exhaust emissions, aligning with STIHL's "Caring for Nature" initiative.
• Adjustable Handlebar: The handlebar can be adjusted to three different positions, ensuring comfort for operators of various heights.
• Additional Battery Storage: A holding slot for a second battery allows for quick swaps, minimizing downtime.
• Grass Catcher and Discharge Options: Includes a 19.8gal grass catcher and options for mulching, bagging, and side discharge.
• Durable Steel Deck: The 21in steel mowing deck is more durable and resistant to wear compared to plastic decks.
• Folding Handle: The handle can fold over for easy vertical storage.

Specifications

What our Experts Think

• Professional AP System battery mower performance – The RMA 510 delivers cordless, gas-like cutting power using STIHL’s AP battery platform, designed for consistent output without fuel, fumes, or engine maintenance.
• Wide 21-inch steel deck efficiency – Built with a 21" mowing deck (20" cutting width) to cover more ground per pass, improving mowing speed on medium to large lawns.
• High-capacity mowing capability – Optimized for efficient lawn coverage (up to ~5,000+ sq. ft. per charge depending on battery), making it suitable for suburban residential properties.
• Brushless motor for durability & efficiency – Equipped with a low-maintenance brushless motor that maintains steady blade speed while reducing wear and service needs.
• Tool-only flexibility (unit only version) – Designed for users already in the STIHL AP ecosystem, allowing them to use existing batteries and chargers for a lower entry cost.
• Smart energy management features – Eco mode and efficient power delivery help extend runtime while maintaining consistent cutting performance in normal grass conditions.
• Operator-friendly design – Foldable handle, adjustable height settings, and large rear wheels improve maneuverability, storage, and comfort during extended mowing sessions.

Q&A

Q: What is the Stihl RMA 510 used for?
A: It is designed for homeowners and light commercial users maintaining small to medium lawns with quiet, zero-emission mowing performance.

Q: What powers the RMA 510?
A: It runs on STIHL’s 36V AP System lithium-ion battery platform, delivering cordless convenience with strong cutting performance.

Q: Is this unit sold with a battery and charger?
A: No, this listing is “unit only,” meaning the battery and charger are sold separately.

Q: What size cutting deck does it have?
A: It features a 21-inch steel mowing deck with a 20-inch cutting width for efficient lawn coverage.

Q: How much area can it mow on a single charge?
A: With a recommended AP battery, it can mow roughly up to about 3,600–5,100 sq. ft. depending on battery type and conditions.

Q: Does it require gasoline or oil?
A: No, it is fully battery-powered, so there is no fuel, oil mixing, or exhaust emissions.

Q: What are the key advantages of this mower?
A: Instant push-button start, low noise operation, low maintenance brushless motor, and eco-friendly performance make it ideal for residential use.

Q: Who makes this mower?
A: It is manufactured by Stihl, a leading global brand known for professional-grade landscaping and forestry tools.

Maintenance Tips

• Clean after every use: Remove grass clippings from the deck, wheels, and vents using a brush or plastic scraper to maintain airflow and cutting efficiency.
• Battery care (if using AP system): Avoid full discharge, recharge after use, and store batteries in a cool, dry place.
• Blade maintenance: Keep blade sharp and balanced; inspect regularly and replace if chipped or worn for clean, even cutting.
• Deck care: Check underside of deck frequently for grass buildup or corrosion and clean thoroughly after mowing.
• Motor protection: Avoid high-pressure washing; keep water away from motor housing and electrical components.
• Wheel & axle cleaning: Remove wrapped grass and ensure smooth wheel rotation to reduce strain on the drive system.
• Fastener check: Periodically tighten handle and deck bolts due to vibration during operation.
• Storage: Store in a dry area, fold handle if applicable, and keep battery removed when not in use.
• Seasonal inspection: Check blade condition, deck integrity, and overall electrical connections before heavy seasonal use.
• Charging equipment care: Keep chargers clean, dry, and ventilated during use.