The UPS is acting strange. The 4 led's indicating the loadlevel has stopped, they stay out. Domoticz (raspberry pi) shows a loadlevel of 140% !!! The battery voltage shows 4,66V. I immidiately performed a shutdown and detached the UPS. An external voltmeter shows indeed 6.6V The ups has become to dangerous to use. Is there any chance to ever get it in proper acting again?