I am currently using Tenergy rechargeables. However, they do not work 100% on any Surefire INCANDESCENT LAMPS. It appears they don't have enough voltage or power to light up the lamp. However, they are awesome on any LED lights I have such as the Surefire M600 Scout light, Pentagon L3, and Gladius Night Ops. In short, in my opinion rechargeables work nicely on LED lights only; keeping in mind that the batteries you use do not EXCEED the maximum voltage the LED can handle.
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