You have a good point.
I like the idea that if i used the flashlight last time .5 or 1 hour I don't have to think about how much battery life is left the next time. Or carry a set of spares on me.
Big lights use batteries big time. Being able to recharge them 10 times pays for the recharging.
How many DE blades would you have to buy over the life of a straight?:D