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Herald1360 · 6th Oct 2019, 10:41 am

Multipurpose lithium grease is soap and oil and is unfortunately water soluble (at any rate the soap bit). Silicone grease is much better for waterproofing jobs like this and won't attack rubber either.

You did better than my efforts last week at a repair cafe- after unseizing the motor, waking up the overdischarged battery with a PSU and series resistor (the high current yours took was just the battery recharging when its voltage dropped a bit) and cleaning off the PCB, the switch / control circuit refused to play so it ended up as WEEE.

(Like lead acid cells, LiIon ones need a current limited constant voltage supply for proper charging. A PSU and series resistor is OK if the initial current is reasonable and you watch the cell voltage (don't exceed 4.2V) carefully. OK to see if an overdischrged one will "wake up" but not recommended for regular charging.)

One tends to detect a whiff of planned obsolesecence in toys like these that deal with both electrics/electronics and water in the same box......

6th Oct 2019, 10:41 am	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Kärcher WV75 Plus window vac that died. Multipurpose lithium grease is soap and oil and is unfortunately water soluble (at any rate the soap bit). Silicone grease is much better for waterproofing jobs like this and won't attack rubber either. You did better than my efforts last week at a repair cafe- after unseizing the motor, waking up the overdischarged battery with a PSU and series resistor (the high current yours took was just the battery recharging when its voltage dropped a bit) and cleaning off the PCB, the switch / control circuit refused to play so it ended up as WEEE. (Like lead acid cells, LiIon ones need a current limited constant voltage supply for proper charging. A PSU and series resistor is OK if the initial current is reasonable and you watch the cell voltage (don't exceed 4.2V) carefully. OK to see if an overdischrged one will "wake up" but not recommended for regular charging.) One tends to detect a whiff of planned obsolesecence in toys like these that deal with both electrics/electronics and water in the same box...... __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O Last edited by Herald1360; 6th Oct 2019 at 10:48 am.