We can get 100 units in Australia from Adafruit. If you order today, we can dispatch this stock between Mar 03, 2021 - Mar 06, 2021.
This is a super beefy non-rechargeable CR2450 Lithium Coin Cell Battery!
Coming in at a 24.5mm diameter and 5mm thickness this battery kicks major butt with a nominal voltage of 3V and a capactiy of 610mAh! For other drain rates the capacity may be reduced, check the datasheet!