Training Log Archive: Mr Wonderful

So learned 21700s exist. They are like 18650s, except slightly fatter, and marginally longer. The end result is a 50% increase in volume and not hard to find in 5000 mah (I suppose 5 ah). Tempting to investigate what options would exist for lightweight and long run time, since I like to run brighter than some of my 18650 friends, maybe this gets one to cord-free.