£699.00 inc. VAT
The STIHL RMA 448.3 V is a versatile self-propelled cordless lawn mower with an 18″ cutting width, perfect for homeowners with medium to large lawns seeking quiet, powerful, and adaptable mowing performance.
The STIHL RMA 448.3 V is a self-propelled battery-powered lawn mower expertly designed for homeowners tending to medium-to-large sized lawns. As a key model in STIHL’s 4 Series range, it delivers quiet, lightweight operation without compromising on innovative features. This mower is an ideal choice for the dedicated home gardener looking for cordless convenience and robust performance.
Engineered with a durable polymer deck, the RMA 448.3 V is lightweight, rust-proof, and double-layered for exceptional stability and longevity. Its 46cm (18″) cutting width covers ground efficiently, while the single-point height adjustment offers a wide cutting range from 20mm to 100mm, adapting to various grass conditions.
This model is part of the interchangeable STIHL AK System. The powerhead cleverly incorporates two battery slots, allowing for a quick switch to a second battery once the first is depleted, minimising downtime. It provides four distinct mowing methods without needing extra tools: standard cut and collect using the grass catcher box, cut and drop by removing the box, side discharge via the integrated flap, and mulching. STIHL’s intelligent electronics ensure constant power output regardless of the battery’s charge level, and an Eco Mode automatically adjusts the engine speed to conserve energy for longer run times.
The mower’s performance varies with the battery used, offering flexibility for different garden sizes:
| Battery Model | Max. Mowing Area |
|---|---|
| AK 10 | up to 130 m² |
| AK 20 | up to 260 m² |
| AK 30 | up to 340 m² |
| AK 30 S | up to 340 m² |
Please note: This is the tool only. Battery and charger are sold separately.
The RMA 448.3 V is packed with user-centric features. The Vario self-drive allows the operator to adjust the mowing speed between 2.0 and 4.5 km/h to match their pace. The unique mono-comfort handlebar provides unrestricted access to the 52-litre grass catcher box, which features a fill-level indicator for convenience. This sturdy handlebar is height-adjustable for ergonomic operation and folds for compact storage. Furthermore, smooth-running wheels ensure excellent manoeuvrability, and with an IPX4 rating for splashwater protection, this mower is built for reliable use, even in typical British weather.
As an authorised STIHL dealer in the UK, Sims Garden Machinery has over 100 years of experience. When you purchase from us, you get more than just a box. Our trained sales staff can provide expert advice in our Stratford-upon-Avon showroom, and our workshop is staffed by trained mechanics for full after-sales support. For local customers, we offer a free PDI (Pre-Delivery Inspection) to ensure your mower is fully assembled and tested, along with complimentary local delivery and a handover demonstration to show you how to operate it safely and effectively.
| Battery System | AK |
| Drive Speed | 2.0 – 4.5 km/h |
| Recommended Battery | AK 30 S |
| Device Weight (without battery) | 27 kg |
| Cutting Width | 46 cm |
| Cutting Height | 20 – 100 mm |
| Rated Speed | 3000 rpm |
| IP Rating | IPX4 |
| Max. Area per charge (AK 10) | 130 m² |
| Max. Area per charge (AK 20) | 260 m² |
| Max. Area per charge (AK 30 / AK 30 S) | 340 m² |
| Grass Catcher Box Volume | 52 l |
| Device Width | 52 cm |
| Max. Device Height | 108 cm |
| Guaranteed Sound Power Level (LWA) | 94 dB(A) |
| Measured Sound Pressure Level (LpA) | 79 dB(A) |
| Vibration Value (ahw) | 1.80 m/s² |
We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on.
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine.
We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth.
The STIHL RMA 448.3 V is ideally suited for medium to large domestic lawns. With the recommended AK 30 S battery, it can mow an area up to 340 square metres on a single charge. The dual battery slot allows you to carry a spare, effectively doubling your potential mowing area if you have two fully charged batteries.
No, this listing is for the ‘Tool Only’ version of the RMA 448.3 V. The battery and charger must be purchased separately. It is compatible with all batteries from the STIHL AK System, allowing you to share batteries with other AK tools you may own.
This mower is highly versatile, offering four different mowing functions. You can (1) cut and collect clippings with the 52-litre grass box, (2) mulch the clippings to return nutrients to the lawn, (3) use the integrated side-discharge flap for longer grass, or (4) use rear-discharge by simply removing the grass box. No additional tools are required to switch between these modes.
The Vario self-drive system provides variable speed control, allowing you to adjust the mower’s forward pace from 2.0 to 4.5 km/h. This means you can set a speed that perfectly matches your personal walking pace and the specific conditions of your lawn, such as mowing on slopes or through thicker patches of grass, for a more comfortable and efficient cut.
| Dimensions | 120 × 54 × 54 cm |
|---|---|
| Brand | STIHL |
| Blade Brake ClutchIndicates if the blade can be stopped while the engine keeps running. | FALSE |
| Collector SizeThe capacity of the grass collection bag or box in litres. | 52 |
| Cutting MethodThe cutting mechanism used (e.g., Rotary or Cylinder). | Rotary |
| Cutting WidthThe width of the grass cut in a single pass. | 46 cm |
| Deck MaterialThe material the cutter deck is constructed from (e.g., Steel, Aluminium). | Polymer |
| Drive TypeHow the mower is propelled (e.g., Push, Self-Propelled, Variable Speed). | Self-Propelled |
| Mowing FunctionsAvailable mowing modes (e.g., Collection, Mulching, Side-Discharge). | [“Collection”,”Mulch”,”Side-Discharge”] |
| Rear RollerIndicates if the mower features a rear roller for creating lawn stripes. | FALSE |
As a brand, STIHL's international reputation goes before it and the name is well known and respected by homeowners and gardening professionals alike.
STIHL has created and honed a number of innovations, particularly in the development of its chainsaws, one of its flagship products. STIHL chainsaws are well known and sought after for their power, sturdy construction, durability and user-friendly features!
We offer a free delivery service for all machines within a 30 mile radius. Not only that; we build, inspect and run up every machine prior to delivery. Making sure you get a fully functional machine that is set-up and ready for use. On delivery we will run through with you any instructions & maintenance advice so you are comfortable with your new machine.
Free local delivery and handover
Industry trained sales team
In-house machinery repairs
Family run since 1908
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