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Sometime I just want to know how much time can my flashlight work.
Especially when I go mountain climbing or have a trip to wild.
It's very important to economical using of power, when we can't get new battery.
Know the surplus time can help us making a plan for using flashlight.
Ming Chuan University
Taoyuan County, Taiwan
Ming Chuan University
Taoyuan County, Taiwan
Chan, Hau-Chun
