Starting yesterday, I noticed my laptop clock is lagging. I'm unsure... but I could guess the loss of a second every 5 hours or so. Nevertheless, I'm almost positive it is slowing down by synchronizing it with my watch and waiting a few hours.
I have no way of measuring power voltage on my laptop CMOS battery. But do you reckon this is a clear sign the battery is dying? This laptop is well over 5 years, on its way to 6. I remember once thinking about this potential problem and thinking to myself it would be ok because probably my CMOS battery was rechargeable...