Rytm Mk1 / Mk2 button cell?

Elektron Gear Analog Rytm
#1

I tried to look for informations on the presence of a buffer battery / internal battery inside the Rytm, I checked some teardown videos and pictures but I didn’t find it.
Not even the manual or other forum posts mention this.
Do any of you know if this machine has internal batteries like other machines, for example the monomachine?
My rytm has been having some malfunctions lately and I wanted to check if it could be due to this.

Thank you!

#2

some pictures here
what’s the issue you’re experiencing?

#3

I didn’t use the machine for several months, when I turned it back on I couldn’t hear the audio and the test gave me an error, after a few attempts it recovered.
So I was wondering if there wasn’t some worn out internal battery that needed replacing.
Looking at the photos you linked and others I found online it doesn’t seem like this battery is present, unless it’s on the back of the CPU board.