16 Crosstrek Premium Quartz Blue Pearl
I standardized on the Ryobi ONE+ system some time ago. I have a large number of their power tools along with a quite a few of the batteries, so I'm never without a charged battery.
They seem to be in the line of business for the long haul, so hopefully my dollars spent will be worth it for a good amount of time.
I "standardized" with Craftsman. You can maybe guess how that turned out.