I have been using my Surefire L4 with 3.7 volt batteries for about a month now. I use the once or twice a week as a supplemental headlamp when bike riding at night. The ride is longer than 50 minutes, so I carry a spare Pila battery to change out when the L4 starts to flicker. I have completed this routin about 10 times.
Last night, when my first battery fell below the regulation threshhold, I replaced it with a freshly recharged Pila and... NO LIGHT. Once I retried it, the light came on, but based on the output, it was clearly out of regulation - and the light was now making a buzzing oscillating sound.
I recharged the batteries immediately when I got home, and then tested the L4. Both fully charged batteries would not give full output, and still their was the Oscillating buzzing sound.
Next, I replaced the Pila with 2 CR123's.... the light sputtered for a few seconds and then full brightness! then replaced the 2X CR123s with a Pila...which resulted in full brightness and no sound.
Is my light defective, has anyone experienced this before, any ideas why? Did the regulator have a hickup?
Any comments would be greatly appreciated.
Last night, when my first battery fell below the regulation threshhold, I replaced it with a freshly recharged Pila and... NO LIGHT. Once I retried it, the light came on, but based on the output, it was clearly out of regulation - and the light was now making a buzzing oscillating sound.
I recharged the batteries immediately when I got home, and then tested the L4. Both fully charged batteries would not give full output, and still their was the Oscillating buzzing sound.
Next, I replaced the Pila with 2 CR123's.... the light sputtered for a few seconds and then full brightness! then replaced the 2X CR123s with a Pila...which resulted in full brightness and no sound.
Is my light defective, has anyone experienced this before, any ideas why? Did the regulator have a hickup?
Any comments would be greatly appreciated.