for the past several months I have been running my provari with the light off. when the battery starts getting low the light does not flash. when the battery is too low the light does come on but the pv no longer works. I have two 18650 2000 mah batts that ive used this way since new (6 or more months) and they still work perfectly. they still hold a charge as long as they did when new. just curious if anyone else does this. let me know please. one other thing, the two original 18490 batts haven't held up near as well. I ran them with the light on and changed and charged them when the light started flashing. they are down to about 1/2 life at this point. all comments welcome.