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STIHL RMA 448.3 RV 18" Cordless Lawn Mower (Tool Only)
£829.00 inc. VAT
STIHL RMA 453.3 PV 20" Cordless Lawn Mower (Tool Only)
Original price was: £779.00.£729.00Current price is: £729.00. inc. VAT
STIHL RMA 448.3 V 18″ Cordless Lawn Mower (Tool Only)
£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.
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Description
Why buy the STIHL RMA 448.3 V 18″ Cordless Lawn Mower (Tool Only)?
- Features a generous 46cm (18″) cutting width and Vario self-propulsion for effortless mowing.
- Versatile 4-in-1 mowing functions: collect, mulch, side, and rear discharge.
- Lightweight yet robust polymer deck is UV and rust-resistant for a long service life.
- Height-adjustable mono-comfort handlebar for easy grass box access and compact storage.
- Part of the flexible STIHL AK System with dual battery slots for extended run time.
- Includes a large 52-litre grass collection box with a fill-level indicator.
Powerful & Adaptable Cordless Mowing
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.
Intelligent Power & Versatile Functions
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.
Designed for User Comfort and Durability
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.
Not sure which machine or part is right for you?
Our team is here to help. Contact us today for expert advice.
Our team is here to help. Contact us today for expert advice.
Technical Specification
| 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 |
Why buy from Sims Garden Machinery?
Authorised main dealer
We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on.
Real people, real support
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
Expert advice — not pushy sales
Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine.
Established, independent family business
We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth.
Frequently Asked Questions
Frequently Asked Questions
What size lawn is the STIHL RMA 448.3 V suitable for?
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.
Does this lawn mower come with a battery and charger?
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.
What mowing options are available with the RMA 448.3 V?
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.
What is the benefit of the Vario self-drive system?
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.
User Manuals / Downloads
Additional information
| 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 |
| Power SourceThe primary energy source (e.g., Petrol 4-stroke, Battery, Electric). | Battery |
| Weight (Net)The weight of the machine itself, excluding any fuel and packaging (kg). | 27 |
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Sims Garden Machinery is a family-run business, serving gardeners since 1908, and an Approved STIHL Dealer in Stratford-upon-Avon — with one of the largest STIHL displays in the region: over 12 metres of the full range to see, hold and compare in person. From petrol and cordless chainsaws to hedge trimmers, brushcutters, leaf blowers, lawn mowers and pressure washers, we stock the STIHL line-up for homeowners, rural estates and professionals right across Warwickshire.
The STIHL battery system
STIHL's AK, AP and AS cordless ranges run a whole set of tools from one battery. Come and see the range in person and we'll help you choose the system that suits your garden.
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Our on-site workshop services and repairs STIHL machines — whether you bought them from us or not — with genuine STIHL parts, chains and accessories. Plus free local delivery and handover on every new machine.
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