Electronics > Electronics

battery life indicator

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lordcalvert:
recently i have been thinking some about how to hook up a red light to the battery so that when it gets low i know when to charge it.   HELP PLEASE!!

ed1380:
my guess would be a comparator and a resistor at a certain value

hgordon:
Try -
    http://www.solarbotics.com/products/index.php?scdfa-250100084

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