Troubleshooting
Robot Vacuum Won’t Charge? Troubleshooting Guide
A robot vacuum that will not charge is often a simple fix, not a dead battery. Work through these causes in order before assuming the worst.
Quick fix
Wipe the metal charging contacts on both the robot and the dock with a dry cloth, then confirm the dock is powered and sitting on a level, hard floor with clear space around it. This alone resolves most charging complaints.
Check dock power first
Before touching the robot, confirm the dock itself is actually powered — check that the outlet works (test it with another device) and that the dock's own indicator light, if it has one, shows it is receiving power. A dock that lost power for any reason will never charge the robot no matter what else you try.
Clean the charging contacts
Metal contacts on the robot and the dock can accumulate a thin film of dust that blocks a good connection. Wipe both with a dry cloth first — this fixes a surprising share of charging complaints.
Reposition the robot and the dock
Confirm the dock is sitting on a level, hard floor with clear space around it (see our dock placement guide for the specifics), since a robot approaching at a bad angle may fail to seat properly even with clean contacts. Manually place the robot directly onto the dock, aligned with the contacts, and see if it starts charging — this isolates whether the issue is docking approach/navigation or the charging connection itself.
Check the battery
If contacts are clean, the dock is powered, and the robot seats properly but still will not charge, the battery itself is the next suspect — especially on an older unit that has done hundreds of charge cycles.
Try a reset procedure
Most manufacturers document a soft-reset procedure (often holding a specific button combination for several seconds) that can clear a charging-related software fault without erasing your maps or settings. Check your model's manual or the manufacturer's support site for the exact steps, since the procedure is not standardized across brands.
Brand-specific differences
Charging-status indicator lights are not standardized — a solid vs. blinking light, or a specific color, means different things depending on the manufacturer. Check your model's manual for what your specific light pattern indicates rather than assuming it matches a pattern you've read about for a different brand.
When battery replacement may be required
If the robot charges to full but drains unusually fast, or will not hold any charge at all after a reset and clean contacts, the battery has likely reached the end of its useful life — a normal wear outcome after enough charge cycles, not necessarily a defect. Check your model's documentation for whether the battery is user-replaceable before assuming you need a new robot.
When to contact the manufacturer
If the robot is still under warranty, or if none of the steps above resolve a total failure to charge, manufacturer support can diagnose hardware faults (like a failed charging IC) that are not fixable at home. Have your model number and a description of exactly what you've already tried ready before contacting them — it speeds up the process considerably.
Replacement parts
We do not currently review standalone replacement batteries for specific models — battery quality and safety vary significantly by manufacturer, so check your robot's official parts store or manufacturer support page for a genuine replacement rather than an unverified third-party one. We do review general maintenance parts kits (filters, brushes, mop pads) in our accessories roundup, though those do not address a charging problem specifically.
Frequently asked questions
My robot charges but drains very fast — is that the same problem?
No — that points to normal battery wear rather than a charging-connection problem. See "when battery replacement may be required" above.
Can I use a third-party replacement battery safely?
Battery quality and safety vary significantly between manufacturers, and we do not have verified data on specific third-party batteries to recommend one. Check your model's official parts store first.
Will a factory reset erase my maps?
It depends on the model and the specific reset type — some soft resets clear only a charging-related fault, while a full factory reset typically does erase saved maps and settings. Check your model's documentation before resetting if you want to avoid re-mapping.