I'm not so good at math, could someone explain to me how 5mAh is 10% of 1350mAh? The leds burn 5mAh and the battery is (at least) 1350mAh. I keep coming up with 3.7%.
If that's true, And you're worried about a few extra minutes of run time, you're better off getting the regular size "extended" battery and forgetting about the leds.