A lot of people in the old forums had some neat Arduino projects using the ChronoDot for situations requiring accurate timekeeping in varying conditions. However, we did get some feedback about the battery positioning; it was soldered in place on the bottom, and it wasn't that easy to source replacements. So I redesigned the ChronoDot...we just got new stock in today. It has a battery holder on the top, but remains pin compatible with the old ChronoDot. Most of them were presold to our distributors though! We'll have more available, just need to get some more batteries for them.
The chip has also been upgraded to the DS3231SN. This is rated for the industrial temperature range, -40C to +85C, instead of 0C to 70C.
Bottom view (yes, there's a silkscreen mistake
Gold-plated battery contact: