I have about 4 systems that have recently lost time and date, I can go by reset date and time , even unplug it and wait 5 minutes and plug back in date and time is good. So it must run down during a more extended power outage? I checked with my distributor tech support to order some batteries but they say the mp has to be sent in to repair, surely Samsung did not make that big of a design flaw that wont allow us to change batteries without sending card in? Does anyone know which battery it is or how to change?