Q: How do I know the CR123A batteries are working properly?

A: Please go through the following checklist to inspect the batteries: Do the batteries have shrink wrap on? Some of our batteries are individually shrink-wrapped. Check to see if it has shrink wrap on. If so, please be sure that the shrink wraps are removed, otherwise, the batteries will not conduct for the light to operate properly. Do not use alternate brands of CR123A batteries. Be sure to use only high quality U.S. made CR123A lithium batteries from PentagonLight™ for high performance flashlights and weapon mounted tactical illumination systems. Use of non-PentagonLight™ brand batteries will void all warranties. The polarity marking is on the side of the batteries. The positive terminal is indicated with a (+) sign while the negative terminal is indicated with a (-) sign. When inserting the batteries into LED lights, be sure the positive terminal faces outward toward the tail-cap end. If you are knowledge in electronics, you can measure the voltage of each individual battery with a volt meter. Most CR123A batteries are sufficiently depleted if the volt meter reads less than 2.5 volt. If you are still experiencing difficulties, please contact our customer service department.