FJD RM21 Multi-Functional Robotic Mower + Free Delivery

Most mowing schedules are built around the people who work the turf, and the grass pays for it whenever the crew is stretched thin. The FJD RM21 Multi-Functional Robotic Mower turns that around: it works through the hours when nobody is free to push a machine, carries its own 4 kWh battery, and finds its way with RTK and LiDAR rather than a person at the controls. For a golf course, a sports field or a large facility, the question shifts from who will cut it today to how the work is planned.

The product is available through this page, by quotation.

Background

FJDYNAMICS and the FJD mower family

FJDYNAMICS markets its robots under the FJD name, and the range is organized by the kind of ground it serves: residential robotic mowers, golf course robots, sports field robots, commercial cleaning robots and a hard surface line marking robot. A digital platform sits alongside them. Within the mower line you will find compact lawn machines, a cylinder mower, an electric greens mower and the RM21, which the manufacturer describes as an all-in-one turf-care solution.

That placement matters when you compare machines. The RM21 is not a small garden unit scaled up; it weighs 190 kg (419 lb) including its battery and measures 1330×853×980 mm (52.4×33.6×38.6 in.). It belongs with the professional grounds equipment in the Mower Robots category and the wider Commercial Robots category.

Positioning and key technology

The RM21 is positioned as a multi-functional platform. The base machine is the RM21 Robotic Mower, and the sources also name four configurations: the RM21 with BP01 Ball Picker Kit, with LM01 Line Marker Kit, with GC01 Grass Collector Kit and with DB01 Dew Brush Kit. The idea is one autonomous carrier that serves several turf tasks, instead of a separate machine for each.

Navigation relies on RTK and LiDAR fusion, which the manufacturer states keeps performance reliable even under trees or in signal-challenging areas. Safety combines real-time 360° LiDAR obstacle detection with front and rear physical bumpers. A phone app lets staff monitor status, create maps and manage schedules, and the mower returns to charge automatically when the battery is low. It also connects with S2 Max, V4e Pro and GolfMind to support a complete turf-care workflow.

Technical Specifications

Specifications as published by the manufacturer; confirmed against the datasheet at quotation.

The manufacturer has not published the number of blades, the noise level, the certifications, the motor power, the connectivity type or the contents of the box; they are confirmed at quotation.

What makes the RM21 different from a standard robotic lawn mower?

The first difference is scale. A single charge covers up to 12,000㎡ (3 acres), and the manufacturer's 72-hour figures are 93,600㎡ (23.1 acres) in standard charging mode and 108,000㎡ (26.7 acres) with fast charging. The battery stores 4 kWh at 48 V DC, gives up to 5 h of work, and recharges in 5 h on standard charging or 3 h on fast charging. Those numbers describe a machine meant to run through a working week, not a weekend lawn.

The second difference is the cutting envelope. The 635 mm (25 in.) cutting width and the 20–127 mm (0.8–5 in.) cutting height range let one machine serve a closely kept sports surface and a longer rough. Travel speed runs from 0 to 6 km/h (0–3.7 mph). On slopes it is rated for a max climbing ability of 20° and a max working slope of 15°, so undulating ground does not automatically rule it out.

The third is the platform idea. Where smaller robotic mowers do one job, the RM21 is offered with ball picker, line marker, grass collector and dew brush kits, so the same carrier can take on more of the turf calendar. If your ground is a modest lawn, a smaller machine such as the FJD FR4000 Robotic Lawn Mower may be the closer fit; the RM21 earns its place where area, slope and variety of tasks are larger.

How does the RM21 stay safe and on course?

Positioning comes from RTK and LiDAR fusion, so the mower does not depend on satellite signal alone. Under tree canopy or near structures, where signal can degrade, the LiDAR side of the fusion helps keep it on its mapped route. Around people and obstacles, 360° LiDAR detects objects in real time, and physical bumpers at the front and rear act as a second line of protection.

The machine is rated IPX4 and operates between 0 and 45℃. Staff manage it from a phone: they can check status, build maps and set schedules from anywhere. A single task can run across multiple zones, which suits large golf courses and sports fields, and when the battery runs low the mower goes back to charge on its own.

Who is the FJD RM21 for?

Golf course superintendents are the clearest match. Multi-zone tasks, long run times and compatibility with GolfMind fit a course made of many separate areas. Sports field managers come next: schools, clubs and municipal facilities with large pitches can schedule cutting around training and matches, and the line marker and ball picker kits address tasks that normally take extra hours.

Landscaping contractors and facility teams with big open grounds, such as campuses, resorts or estates, will also find a use for a machine that covers 12,000㎡ (3 acres) per charge. Buyers who also use S2 Max or V4e Pro can connect them to the RM21 in one turf-care workflow. Owners of smaller or simpler plots may prefer a lighter machine from the Mower Robots range.

What is the FJD RM21 used for?

1. Routine mowing of large turf. Scheduled autonomous cutting with a 635 mm (25 in.) width across big open areas.
2. Golf course maintenance. One task can run across several zones, with GolfMind compatibility for course workflows.
3. Sports field care. Regular cutting of pitches, with a cutting height adjustable between 20 and 127 mm (0.8–5 in.).
4. Ball collection. The RM21 with BP01 Ball Picker Kit is the configuration named for this task.
5. Line marking. The RM21 with LM01 Line Marker Kit is the configuration named for marking lines.
6. Clippings and dew management. The GC01 Grass Collector Kit and DB01 Dew Brush Kit round out the configurations.

Pricing and Availability

The RM21 is sold by quotation only, and the quote covers the base RM21 Robotic Mower or any of the kit configurations you need. Delivery, customs and support are arranged together with the quotation, so you deal with one conversation instead of several. Send us your site details and the configuration you have in mind, and the product is available on this page.

Frequently Asked Questions

How large an area can the RM21 mow on one charge?

The manufacturer gives a max mowing area per charge of 12,000㎡ (3 acres), with a max working time of 5 h.

How long does charging take?

Standard charging takes 5 h and fast charging takes 3 h. The mower returns to charge automatically when the battery is low.

Can it work on slopes?

The max climbing ability is 20° and the max working slope is 15°.

How does it avoid obstacles?

It uses real-time 360° LiDAR obstacle detection together with front and rear physical bumpers. RTK and LiDAR fusion handles navigation.

Can I control it from my phone?

Yes. The app lets you monitor status, create maps and manage schedules on your phone.

Which configurations are available?

The sources name the RM21 Robotic Mower and versions with the BP01 Ball Picker Kit, LM01 Line Marker Kit, GC01 Grass Collector Kit and DB01 Dew Brush Kit.

Where can I buy the RM21 and what does it cost?

The RM21 is available through this page, by quotation. Pricing is given in the quotation, together with delivery, customs and support.

Summary

The RM21 answers the problem of mowing hours that never quite fit the crew. With a 4 kWh battery, up to 5 h of work per charge, RTK and LiDAR navigation, multi-zone tasks and a phone app for scheduling, it takes the routine cutting off the team's hands. The four kit configurations extend it toward ball collection, line marking, clippings and dew. For golf courses, sports fields and large facilities, this page is the starting point.