4 Year batty life flashlight ( not turning it off )


The latest design I have gets maximum brightness ( just before burn out of LED ) 60 – 80 uA so if we used 6 AA batteries that equates to 34992 hours or 1458 days ( 24 hour use ) or 3.995434 years. With a 9V transistor battery that equals 7625 hours or 317.7 day ( 24 hours a day )

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