My metal band that I have been using for 10 years fits perfectly.

I will have to do a battery test over the next few days; I charged it to 78% yesterday evening and will see how the level drops over the next week.

Edit: It has been 5 days since I charged it to 78%; currently sitting at 44%; so 34% in 5 days ~7%/day. I'll probably charge again at 20% which should be in 2 days.