Nevadent Dental Water Jet Repair - What to do when your wireless charger dies

Hello gays, today i am repairing a water dental flosser in a "dodgy" way :) In case your wireless charger dies what will you do? Throw the device in the trash? Or maybe it's better to convert it into a wired and working one?
Let's find it out! :D
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My device works for 5 seconds and stops. The battery is charged. I press the button again and the same. 5 sec and it stops. The charging light flashes. I repeat. The battery is fully charged. What could it be?