Quoted from Pin_Guy:I'm going to sound like a broken record on this again...
Coin Cell ... WHY? Just install 3 AA lithium batteries in your stock holder if you want Lithium batteries. My same set of batteries has been in my machine for almost 6 years now...no I do not worry about them at all.
NVRAM Good way to go if you don't care about having a clock, some people may actually prefer to use the clock as an hour meter. Clock time, gets a bad rep because it seems to be off by days or months at a time, but if you actually looks at the time its always correct ... odd right ASIC keeps solid time but not the dates.
Alkalines? You are nuts to install on ever.
Lithium AA? Seems so obvious but swear I never heard this before. Good info as usual, thanks.