CR927 RTC Battery lifetime

userHead Agree_dk 2019-02-13 22:21:09 3520 Views2 Replies
The RTC battery (CR927) on my first Alpha is already dead, think it have been some time now, but first checked it today.
So my question is, for how long (or short) time should the battery normaly last?

Also wonder if the battery have anything to do with the dead/missing Arduino comport?

PS. expect to get new battery tomorrow, so I can test it