RTC_CTRL_D_VRT
if (!(rtc->read(rtc, RTC_CTRL_D) & RTC_CTRL_D_VRT))
((ctrld & RTC_CTRL_D_VRT) ? "ok" : "exhausted or n/a"),
(ctrld & RTC_CTRL_D_VRT) ? "ok" : "not ok or N/A");