I am using STEVAL-STWINKT1B.I want to connect the battery that came with the STEVAL-STWINKT1B and keep the time information (RTC), but it doesn't work.Even if STM32L4 is shut down (HAL_PWREx_EnterSHUTDOWNMode ()) with the battery (VBAT = 3.7V @ measu...