5ds R date/time resetting when battery swapped

[magyarw]

I just had my 5ds R serviced by canon for an unrelated issue. Since getting the camera back, every time I switch batteries, the camera resets the date and time. It also seems to resets to different dates/ times. Sometimes it's 1999/01/01 and today it reset to 2015/01/01. Also, the date and time stamp for each image are not in sequential order so when I look through downloaded images on my computer they are not in the order they were taken in.  

I am aware that leaving the battery out of the camera for a few minutes can reset the date and time but I am swapping for a fresh battery immediately so a battery is only out of the camera for a few seconds.   It's my understanding that these cameras don't have a separate battery for the date/time so I am unsure of how to fix this problem. I've had this camera for a few years and never had this happen before. I know that canon updated the firmware when the camera was serviced, could that have something to do with it?

Any help would be appreciated.

[wq9nsc]

The 5DS, 5DS R and probably a lot of other Canon camera bodies use a "super capacitor" as a backup power source for the clock.  It is basically just a large value capacitor with low leakage.  When the camera battery is installed, the capacitor is charged and when the battery is removed the capacitor supplies voltage to the clock/calendar circuit to keep it alive.

IF the battery is left out for a long period of time, then the capacitor will fully discharge and you will have to reset the clock.  It should be good for at least a couple of weeks.  If not, then the capacitor has deteriorated with age or there is a fault in the circuit causing additional drain.

I just replaced one of these style of caps in a clock radio last month but it lasted 12 years so that was a decent life.  This capacitor method has been a very common backup method for a couple of decades.

Rodger