After longer pause in usage, I started again using my lovely Nikon Coolpix 4300 camera. However I noticed that each time when I replace my battery for a new one, I lost all the settings and date. That is very annoying at least.
I get the service manual and there is no word about the backup battery, however on one image the battery is visible clearly:

(page 17)
So my question is - what battery type this is, so I can obtain it before I try to replace it

Thanks for the information.
PS. the 135uF 330V custom capacitor is there for the flash only, I hope?
That was my inquiry to Nikon and I hope I could post soon how they replied and what was my result from attempted fix of this camera...