Is the STIHL RMA 243.3 Cordless Lawn Mower right for you?
The STIHL RMA 243.3, also widely listed as the STIHL RMA 243, is a battery-powered push lawn mower for homeowners who want cordless convenience with the substantial construction of a steel-deck machine.
Its 41cm cutting width is suitable for smaller and medium-sized domestic lawns, providing efficient coverage while remaining manoeuvrable around borders, trees, paths and garden features. The mower forms part of the STIHL AK System, allowing compatible batteries to be shared with other STIHL domestic cordless garden tools.
Choose the tool-only version if you already own a compatible AK battery and charger, or select the complete kit containing an AK 20 battery and AL 101 charger.
STIHL RMA 243.3 at a Glance
- Best suited to: smaller and medium-sized domestic lawns
- Drive: hand-propelled push mower
- Cutting width: 41cm / 16 inches
- Cutting height: centrally adjustable from 20 to 100mm
- Mowing methods: collect, cut and drop, side discharge and mulch
- Grass collection box: 52 litres with fill-level indicator
- Deck: durable sheet steel
- Battery system: STIHL 36V AK System
- Recommended battery: STIHL AK 20
- Approximate AK 20 coverage: up to 230m² per charge
- Weight: approximately 26kg without battery
- Battery slots: two, allowing a spare battery to be carried on the mower
Why Masseys Recommends the STIHL RMA 243.3
Masseys recommends the RMA 243.3 to customers who want the easy starting, quiet operation and lower routine maintenance of a cordless mower but prefer the solid feel and durability of a steel cutting deck.
Its 41cm width is a useful middle ground: it covers a typical domestic lawn more efficiently than a compact entry-level mower without becoming excessively wide or difficult to manoeuvre around beds and garden features. The ability to collect, mulch, cut and drop or use side discharge also makes it more versatile than a collection-only mower.
The most important consideration is its weight and drive system. At approximately 26kg before the battery is fitted, this is a substantial hand-propelled mower. We particularly recommend it for reasonably level lawns and customers who are comfortable pushing a heavier, solidly built machine. For steep slopes, uneven ground or customers who want the mower to assist with forward movement, the self-propelled STIHL RMA 443 V may be the better option.
Four Different Ways to Mow
The RMA 243.3 can be configured for four mowing methods without requiring a separate mower:
- Cut and collect: clippings are gathered in the 52-litre collection box for a tidy finish.
- Cut and drop: remove the collection box and allow the clippings to fall behind the mower.
- Side discharge: use the integrated side-discharge flap when cutting longer grass or when collection is unnecessary.
- Mulching: finely cut clippings are returned to the lawn using the multi-blade and mulching configuration.
Always refer to the supplied instruction manual before changing mowing configurations.
Battery Options and Lawn Coverage
The mower uses interchangeable 36V batteries from the domestic STIHL AK System. The same compatible battery can be used in a variety of STIHL cordless hedge trimmers, grass trimmers, blowers, chainsaws and other garden tools.
| Battery | Approximate area per charge | Recommendation |
|---|---|---|
| STIHL AK 10 | Up to 115m² | For smaller lawns and lighter mowing |
| STIHL AK 20 | Up to 230m² | Manufacturer-recommended battery |
| STIHL AK 30 S | Up to 300m² | For additional coverage between charges |
These are manufacturer test estimates rather than guaranteed mowing areas. Actual coverage will vary according to grass length, moisture, cutting height, terrain, battery condition, mowing speed and how frequently the mower encounters heavier growth.
The RMA 243.3 has two battery slots, but it does not switch automatically between them. One battery powers the mower while the second slot allows a charged spare to be carried. When the first battery is depleted, the user manually moves to the second battery.
Customers purchasing the tool-only mower can browse compatible STIHL battery chargers and the wider STIHL AK System range.
Durable 41cm Steel Cutting Deck
The sheet-steel mower housing provides a robust and torsion-resistant cutting deck for regular domestic use. The 41cm width provides more efficient lawn coverage than a narrow compact mower while still being controllable around borders, trees, pathways and garden furniture.
A flow-optimised blade reduces unnecessary air resistance, helping the mower use the stored battery energy efficiently.
Constant Power and Power Boost
STIHL Constant Power electronics are designed to maintain consistent cutting performance as the battery charge level falls, rather than allowing performance to gradually reduce throughout the charge.
Power Boost allows compatible STIHL batteries and the mower to communicate electronically so that the battery can supply the level of power required for the current cutting conditions.
Central Cutting-Height Adjustment
The cutting height can be adjusted centrally between 20 and 100mm. One control alters the mower height, avoiding the need to adjust every wheel separately.
Use a higher setting for long grass, uneven ground or the first cut of the season. The height can then be reduced gradually over subsequent cuts rather than removing too much grass in one pass.
52-Litre Folding Grass Collection Box
The 52-litre grass box has a fill-level indicator to show when it is ready to be emptied. Its folding design helps the two halves open fully, allowing the clippings to be tipped out more easily.
The mono-comfort handle is mounted on one side of the mower, leaving unobstructed access to the collection box when removing or refitting it.
Height-Adjustable Mono-Comfort Handle
The handlebar can be adjusted without tools to suit the user’s height. It can also be folded for storage or transport, helping the mower fit into a shed, garage or vehicle.
Integrated carrying points assist with lifting, although customers should remember that the mower weighs approximately 26kg without its battery.
Technical Specifications
| Model | STIHL RMA 243.3 / RMA 243 |
|---|---|
| Battery system | STIHL AK System, 36V |
| Recommended battery | STIHL AK 20 |
| Approximate area with AK 20 | Up to 230m² |
| Drive | Hand-propelled / push |
| Cutting width | 41cm / 16 inches |
| Cutting height | 20–100mm, centrally adjusted |
| Mowing methods | Collect, cut and drop, side discharge and mulch |
| Grass collection box | 52 litres with fill-level indicator |
| Deck material | Sheet steel |
| Battery slots | Two |
| Weight without battery | Approximately 26kg |
| Handlebar | Height-adjustable and folding mono-comfort handlebar |
| Protection rating | IPX4 splashwater protection |
| Tool-only part number | WA200111400 |
| Kit part number | WA200111403 |
Manufacturer working-area figures are approximate. Specifications may be updated by STIHL without prior notice.
Which STIHL Cordless Mower Should You Choose?
| Model | Cutting width | Best suited to |
|---|---|---|
| STIHL RMA 239 C | 37cm | Customers wanting a lighter, more compact mower for smaller lawns |
| STIHL RMA 243.3 | 41cm | Customers wanting a robust steel-deck push mower with four mowing methods |
| STIHL RMA 248 | 46cm | Wider lawns where a larger cutting width reduces the number of passes |
| STIHL RMA 443 V | 41cm | Sloping or more demanding lawns where variable-speed self-propelled drive is useful |
Browse all of our cordless lawn mowers or compare the complete STIHL lawn mower range.
Why Buy Your STIHL RMA 243.3 from Masseys?
Masseys is an authorised STIHL dealer based in Woodville, Swadlincote. Our garden-machinery team can help you determine whether the RMA 243.3 is suitable for your lawn, compare tool-only and kit options and choose the correct battery and charger.
- Genuine STIHL machinery and warranty support
- Tool-only and complete battery-kit options
- Practical advice based on lawn size, terrain and storage
- Assembly and pre-delivery inspection options
- Local collection and delivery options
- In-house machinery servicing and after-sales support
For ongoing maintenance, blade care and repairs, visit our garden machinery servicing and repairs department.
Frequently Asked Questions
Is the STIHL RMA 243.3 self-propelled?
No. The RMA 243.3 is a hand-propelled push mower. Customers with steep slopes, difficult ground or who prefer powered wheel drive should consider a self-propelled alternative.
How large a lawn can the RMA 243.3 mow?
The recommended AK 20 battery can mow up to approximately 230m² under manufacturer test conditions. An AK 30 S battery can provide an estimated area of up to 300m². Real-world coverage will depend on the lawn and mowing conditions.
Does the mower include a battery and charger?
That depends on the option selected. The tool-only version does not include a battery or charger. The kit version includes one STIHL AK 20 battery and one AL 101 charger.
Can I use an existing STIHL AK battery?
Yes, provided it is a compatible STIHL AK System battery. The AK 20 is the recommended option for this mower.
Does the mower automatically switch between its two batteries?
No. The second slot carries a spare battery. When the operating battery is depleted, the user manually switches to the charged spare.
Can the STIHL RMA 243.3 mulch?
Yes. Mulching is one of its four mowing methods, alongside collection, cut and drop and side discharge.
Can it be used in wet conditions?
The mower has IPX4 splashwater protection. However, cutting and collection performance are generally better when the grass is dry or only slightly damp. Avoid mowing saturated ground and always follow the safety instructions in the supplied manual.
Can Masseys service the STIHL RMA 243.3?
Yes. Masseys provides garden-machinery servicing, inspections, blade maintenance and repair support from our workshop in Woodville, Swadlincote.
Order the STIHL RMA 243.3 from Masseys
Select the tool-only mower if you already own a suitable STIHL AK battery and charger, or choose the complete AK 20 and AL 101 kit for a ready-to-use package.
For advice about lawn suitability, batteries, delivery or alternative models, contact the Masseys garden machinery team.
