LUBA charging power adapter: it has no waterproof rating, and they can fail outdoors

Why this happens

The mower and its charging station are built to be rained on. The power adapter is not. One owner, now on their third failed adapter, asked Mammotion support about it and quotes the written reply: "The power adapter itself has no declared waterproof rating and cannot be considered waterproof." Support added that the product page and manual do not say the adapter must be kept somewhere sheltered and dry, and that doing so is a recommendation rather than a requirement. Their advice was an outdoor GFCI socket with a weatherproof cover¹. The owner points out that is exactly where most people plug it in.

What owners report

• Adapters dying after months outside. One owner's adapter lasted about 12 months "near covering but not directly" and was replaced under warranty; another is on their second outdoor adapter¹. A third owner's first adapter died in six months outdoors, and its replacement has worked for a year indoors². Indoors is no guarantee: another owner in the first thread lost two adapters within 18 months, both indoors¹. A fourth says Mammotion replaced theirs twice in two years, the second time just before the warranty ran out¹². Nor does every adapter fail: owners in that thread report original adapters that lasted two to four years, one of them left uncovered outdoors for the last year, and one who has kept theirs in a waterproof box since the first day has had no failure in three years¹.

• Charging that starts and stops. A LUBA 2 AWD owner watched the mower start charging, stop, and start again while the adapter's light dimmed each time the mower connected. The adapter turned out to be water-damaged: "It was a water damage in the brick, so it was obvious."³ Another LUBA 2's adapter would stop charging halfway².

• A tripped safety switch. A LUBA 2 AWD 3000X owner found the residual-current device (RCD, the safety switch that cuts power when current leaks to earth) tripped in the garage, and traced it to the adapter⁴. Mammotion sent a new adapter. The mower then showed as charging while its battery did not rise, so it went back for repair: the adapter was not the only fault⁵. Other owners in that thread say 2024 and 2025 mowers use different adapters, and that a wrong one can look like it is charging without the battery level rising⁵. The owner's old and new adapters were rated 28 V and 25 V, which the owner says Mammotion told them did not matter, and a Mammotion account asked for a photo of the new adapter's label⁵.

• A quick fix on a LUBA 3. A LUBA 3 owner whose mower stopped charging contacted support by chat. Support identified the adapter, and a new one arrived and fixed it within a week⁶.

• Slow charging as the first sign. A LUBA 2X 3000HX owner noticed the mower "taking forever to charge" and sent logs from the app; support said the log showed a malfunctioning power supply. A replacement was offered, then a €125 charge once the owner said the mower was a gift and had no order number. The next day Mammotion emailed to say it acknowledged the warranty was active and had escalated the case, and two days after the first post the owner wrote that it had agreed to send the power supply under warranty⁹. The owner later added that Mammotion checked photos of the packaging and the unit number, then sent a new power supply, and that the mower works again¹⁸. How support handles that is on the support and repairs page.

• Several failures for one owner. In the thread where the tripped switch was first reported, one owner says three adapters have failed: one on a LUBA 2X, which the owner blames for killing the battery while its light stayed on; one simply dead on a LUBA 1; and one faulty out of the box in a full replacement kit from Mammotion. Another owner waited about a month for a replacement adapter, which Mammotion shipped from China because none were available in the US⁸. Neither says where their adapters were kept.

• A battery that looked dead. A LUBA 2 AWD 1000H, a refurbished replacement 13 months old, charged from 0 to 100 percent on the dock, sat at 100, then dropped to 0 while still docked, three times in 36 hours. Its owner later wrote that the cause was the charging station's power adapter and not the battery. It was the third adapter to fail at their house, each installed where the install guide puts it. Support's answer was a paid repair and a cleaning stand, because the refurbished unit was out of warranty¹⁰.

• Bricks and a dock, repeatedly. A LUBA 2 (2024) owner says the docking station or power supply keeps burning out. Another owner went through two power bricks and a docking station and the problem came back, so they returned the whole set. A third says that after complaining, Mammotion offered a 30% discount on the $140 power supply¹¹.

• Four owners in a German forum. One owner's power supply trips the house fuse as soon as it is plugged in; the supply, the station and the RTK antenna lights were all dark, support gave a ticket number after two weeks and then went quiet for two weeks¹⁴. A LUBA 2X owner's mower would not charge even after Mammotion sent a new power supply; a new charging station, delivered about ten days later, fixed it, and the owner writes that the mower itself was not at fault¹⁵. A third, with a LUBA 2 1000 bought in July 2024, reports the same power-supply fault, says it was reported within the warranty and that Mammotion made no replacement offer, and found a new supply through a classifieds site, after which it charged again¹⁶. A fourth, with a LUBA 2 1000 bought in mid-2024 that had charging dropouts for weeks, says support turned down warranty and goodwill, and that after a polite written objection a new power supply was agreed on goodwill¹⁷. That is a German-language forum, not a statement about Mammotion's other markets.

Not every charging failure is the adapter. In the same thread as one of these reports, an owner points out that a mower docking crooked or dirty contacts are more common causes². The contact-pin guide and the dealer's charging-station diagnosis cover how to tell them apart, including how to test the adapter with a meter.

What Mammotion says

Mammotion's own return-to-charge guide says that if the station and adapter are powered but the lights are off or behaving oddly, you should check the contacts for dirt or corrosion and check that the cable between the adapter and the station is firmly connected. If you have a multimeter, measure the adapter's output and the voltage at the station's contacts. It also gives a hard stop: "If you notice excessive heat, melted charging contacts, exposed wires, corrosion, or burn marks, immediately disconnect the power supply and stop using the charging station."⁷

For a replacement, a Mammotion account told owners to contact official customer service and said Mammotion would check stock².

Some owners have wired in non-Mammotion power supplies while they wait. This site does not recommend that. A substitute has to match the original's voltage and current, and one of those owners warns that getting the wiring backwards can damage the mower or the station³. One owner in the first thread, whose Mammotion adapter lasted about 12 months, spliced the old plug onto a third-party supply and says it has worked for 24 months¹³. That is one report and it does not change the advice: wait for the official part.