Interesting light.

Safest multi-cell light ever made, since it’s basically 3 separate lights connected to one switch. You can use different types of 18650s with different charge levels in them with no risk. Don’t try that with any other multi-18650 light.

Incidentally, with an XML footprint you could replace them with SST40s (though it would be quite hard to do). However, I doubt the S6330 provides enough current to drive them to their max.