Does anyone of the forum have experience in replacing the motherboard bios battery on an SDR?, seems it's different to the HRD and MDR in that the battery doesn't clip in but looks to be possibly soldered in and the retaining clip has 2 small punch marks on the top, also the battery is a smaller version used in the other recorders, doesn't seem to want to just slide out and don't want to tug it to hard in case I split the solder.grateful for any input. Battery might be a CR 1216