Tuxedo Laptop Battery acting strange - replaced

Currently I use as my productivity working device a Tuxedo Laptop, the Infinity book pro 14". It is about 1.5yrs old and started acting up in december when it comes to battery. The Battery sometimes was overnight discharging to 0% even the laptop was powered off. Also it showed a reduced maximal capacity. In Linux you can check your battery stats quickly with upower -b the old battery looked like…