Keeppower 16650 3.7V 2500mAh Protected Lithium ion Battery

The toughest part of owning a higher end flashlight is keeping it fed with reliable batteries.I bought these with doubts, but the price was right and I was willing to take a gamble. I'm glad I did.I've used these in a couple different models of flashlights that run on two Lithium CR123A batteries-the Surefire Fury Tactical model and an Inova X5 LED model. The batteries drop right in without any wiggle.They seem to come fully charged, but I topped them on a universal charger just to be sure; so far the first battery I put in (roughly 2-3 weeks ago) has not needed to be recharged yet. (UPDATE: The battery lasted into July in a Surefire Fury flashlight. Extremely satisfied!)They come with a little plastic carrier case so you can carry a spare with you with out worrying about them shorting out in your pocket and making you "dance like John Travolta".If there's any complaint it's that they take a while to charge, but that might be due to the universal charger that came included with a laser pointer. Expect roughly 12 hours turnaround time from when you plug them in to when they're fully charged. Otherwise, I'm quite optimistic.

Works great as a replacement for the atn ir light battery

Battery seemed good when I got it but the plastic cover is starting to come off, I don't know how long it will last.

Was not what I needed.

Excellent protected battery that gives my Surefire flashlights a rechargeable option.