Hello, I'm new to electric scooter repair. I have a scooter from the brand CENTURFIT, and I'm having a problem with the controller NJ-AOXIONG AX-HB02. It shows that the battery is completely discharged, but when I check the battery with a multimeter, it reads 40 volts—both the one that powers the controller and the one you charge. Do you know what the problem might be?