Battery power source

5 pts.
Tags:
Alert
Batteries
Led
Power sources
What is the smallest battery source that i can use to support a device much like an old beeper and a green LED. The beeper only works once or twice per year 4 times at the most, the green LED will be used fulltime. The battery source can not be rechargeable, and cheaper is better.

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You might want to look at the one like this battery it is designed to last 10years in a smoke alarm. The always-on aspect of an LED, even if it is drawing minimal power (around 5 mA) will still place a drain on the battery. If your circuit will allow, try setting up a flasher, that will illuminate the LED on briefly at long intervals, similar to this one.
Good Luck!
-Flame

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