Led Battery
How long would a 9v battery run a single LED light?
im doing this thing and im wondering how long the LED light will run being hooked up to a 9v battery, approximately how long to the battery goes flat?
A typical 9 volt battery is rated at 500 mAh. See the link below. A typical LED takes 20 mA. So a 9 volt battery should run one LED for 500/20 equals 25 hours.
#6) Project ForkenSwift electric car: LED battery gauge
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