Based on some strong recommendations here, I recently ordered two Fenix L2D Premium flashlights as an upgrade to my L&M Vega. However, one feature I liked was the Vega's low battery indicator. The Vega has a handy green light that blinks when the batteries are low and automatically switches to a lower setting to conserve battery life, before outright dying. I've yet to run a set of batteries dry on the L2D Premiums and I'm wondering if there's any indication that the batteries are weak before the light switches off?

I've read that the Fenix P3D flickers before dying. Does the L2D Premium do the same? Or does the light autmatically switch to a lower setting when the batteries are weak? Although I plan on carrying spare batteries, I'm worried that the light suddenly will die without warning, which could lead to some hairy situations. Any advice or information is much appreciated.