Originally Posted by
2manybikes
Don't run any type of battery all the way down.
I do run them until the lite quits, while riding, then I switch to the next battery. there's no "gauge". the light heads have a lite that starts green but goes to red. but it can continue shining while on red, for a really long time & the green doesn't last as long as the light is usable. meaning it seems wasteful to change batteries as soon as the light turns red. it would be nice if it had an in between yellow lite