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Well, assuming you keep your battery charged and limit the LED's current at or below its spec it should last you for a good 100,000 hours or so.
yes, a small led normally 20ma? last like a week or two on a button cell, but to work this out just see you battery backs label where it says ??mah
and seeing as most rego leds consume 20ma (see your leds datasheet to confirm) for this example well say the battery has 1600mah and the led consumes 20ma. youd get approx 80hrs.
Quote from: ArcMan on February 17, 2009, 08:23:15 PMWell, assuming you keep your battery charged and limit the LED's current at or below its spec it should last you for a good 100,000 hours or so.This number is pulled out of the air.For all you know that battery could have a capacity of 100mAh or 100AhTo find out how long a battery will last you need to use the following calculation:mAh of battery / mA draw of circuit1000mAh battery / 20mA draw of circuit = 50 hours
how long will a LED run on a 6v battery?
Check the battery for its 'mAH' as that is the total number of milliamps it can supply for one hour before dying. It could supply half the current for twice as long. etc. Just do the maths.The datasheet for the LED may also hint at the life expectancy of the LED before it goes pop. But, with the correct current limiting resistor, this should tend towards infinity.