Why do battery runtimes vary?
The efficiency of LEDs vary from one LED to the next. Therefore the amount of power it takes to generate the same amount of light will very from one LED to the next. We have chosen to hold the light output constant and allow the input power to vary. This results in constant light output but causes variations in the battery runtime from one flashlight to the next. We guarantee a minimum battery runtime at the rated light output. Typical runtimes will be 25% higher than the minimum runtime. The type of battery used will have an impact on battery runtime. The most significant difference in batteries is how they handle the highest power levels. You should always choose batteries that can handle high continuous currents. Alkaline batteries are a poor choice in this type of application. Lithium and nickel metal hydride are the preferred battery chemistries for high power applications. Temperature can also have a significant impact on battery runtime. As the battery temperature drops towards
