I have a roborock Q7 M5+ that I run in my Minneapolis apartment, and the routine includes pulling the mop pad off, rinsing it, and pressing it back on while the dock is still powered. Winter here keeps indoor humidity low, and I have noticed a small snap a couple of times when handling the pad near the charging dock. Since this is a general ESD discussion, I am wondering how people here think about static discharge risk around battery-powered appliances that sit on powered docks. My concern is whether touching the mop pad or the tank contacts could send a discharge into the robot’s control board. I have no test equipment at home and have not measured anything, so I am going only on what I have read online. Should I be unplugging the dock before handling the pad, or is that overkill? Would appreciate input from anyone who deals with ESD in ordinary home electronics.
The snap you’re hearing is likely a small discharge between you and the pad or dock, not necessarily into the control board. In low winter humidity, synthetic pad fibers can build charge easily, and the dock’s grounded path matters more than the robot’s battery. Unplugging the dock before handling the pad is a reasonable precaution, though it may be more than strictly needed. At minimum, touch a grounded metal surface first and avoid touching exposed tank contacts. Without measurements, treat the snap as a prompt to reduce charge buildup rather than evidence of board damage.