I have a quite simple question and quite a simple circuit in mind. I have an application, which is battery powered and uses a RTC clock for timekeeping. I would like to preserve the time during battery change, which is to be expected less than 10mins. The RTC consumes 5uA max. and keeps working until Voltage is as low as 1.3V.
According to the standard RC discharge formula, a capacitor of about 1mF would be enough.
Is this circuit for backing up the RTC too simple/ have I forgotten anything on there?
Thanks in advance