So this patient monitor was complaining about the clock was off every time it was started, the most obvious problem would be the RTC backup battery for the unit.

I started out by removing the panels that i could find but properly by design they choose not to make this user exchangeable.

The battery neede for the job is an CR1220 3V lithium cell (i always choose batteries from Panasonic for such an task)

First of all Sorry for the crappy picture quality

From the back (yes i removed the serial number on the unit)
You will need to to remove the screws on the back from peel of the front of the unit.

Gently remove the front panel, be careful with the cables, they can be disconnected with ease.

View of the panel.

High voltage converter for the CCFL lamp inside the panel

Slide the panel to the side and in an upper left corner the battery is located, pop out the battery and exchange it with the new one (be carefully not to touch the battery use some paper when mounting it.

Reverse the process to assemble the unit.

After the battery have been changed you need to setup the clock again, and this should be it, the new battery should work for the next 7 years, depending on usage.