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known-issue

LUBA charging power adapter: it has no waterproof rating, and owners keep losing them outdoors

Models covered
LUBA 2 AWD, LUBA 2 AWD X, LUBA 3 AWD
Affects
Robot body — not the app
First reported
12 September 2025
Last updated
30 September 2026
Status
Open

What to do next

  1. Check the adapter's and the station's lights, make sure the cable between them is firmly connected (unplug and reconnect it), and look at the contacts for dirt or corrosion. If you have a multimeter, measure the adapter's output and the voltage at the station's contacts.

    Applies when: the mower reaches the station but does not charge, stops charging partway, or the station shows no light.

    Worked if: a loose connection or dirty contact is found and fixed, or the adapter is shown to be the fault.

    Didn't work? Next: step 2 — Contact Mammotion support for a replacement adapter. If the...

    Stop and get help if: you see excessive heat, melted contacts, exposed wires, corrosion or burn marks - disconnect the power and stop using the station, as Mammotion's own guide says.

    Method: Mammotion's own return-to-charge guide (manufacturer statement)

  2. Contact Mammotion support for a replacement adapter. If the adapter trips your home's safety switch (RCD, or GFCI in the US), leave it unplugged until it is replaced.

    Applies when: the adapter has failed or is suspected, or it trips the safety switch.

    Worked if: a new adapter restores charging, as it did for the owners below.

    Didn't work? Next: step 3 — Put the replacement somewhere dry and sheltered - indoors, or at...

    Method: a Mammotion account inviting owners to contact support for a replacement, and owners whose replacements fixed it

  3. Put the replacement somewhere dry and sheltered - indoors, or at least out of the rain - and plug it into an outdoor GFCI/RCD socket with a weatherproof cover if it has to be outside.

    Applies when: the old adapter was outdoors or in a damp spot.

    Worked if: the new adapter is not exposed to the water that owners blame for the old one.

    Didn't work? Next: step 4 — Tell us how long your adapter lasted, where it was plugged in,...

    Method: Mammotion support's written reply that the adapter is not waterproof, and owners' placement outcomes

  4. Tell us how long your adapter lasted, where it was plugged in, and what Mammotion offered.

    Applies when: an adapter failed, or has lasted outdoors without trouble.

    Worked if: the pattern gets clearer for the next owner deciding where to put theirs.

    Method: this page's own closing request

Did this work, or not? Tell us what happened — a report from someone who hit it is what turns one dealer's method into a documented fix.

Independently reported 2 times by different owners. Manufacturer has acknowledged this. This records that the issue was independently reported — it isn't an estimate of how common the issue is among all owners.

Before you start: the power adapter (the "brick" between the wall socket and the charging station) is not waterproof, even though the mower and the station are. If your mower has stopped charging and the adapter lives outdoors, suspect the adapter, get a replacement from Mammotion, and put the new one somewhere dry. If you see heat damage, melted contacts or burn marks, unplug it and stop using it.

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.
  • 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.
  • 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.

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. Wait for the official part.

If your mower has stopped charging and the adapter is outdoors: check the lights and the cable connection, and look for heat damage — if you find any, unplug it and stop. Contact Mammotion for a replacement adapter, and put the new one somewhere dry. Tell us how long yours lasted and where it was plugged in.
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Sources