# leds will close one by one as the battery runs down each led will

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Simple 12V Battery Status Indicator | Circuit Diagram This is a very useful project of a simple 12V battery status indicator circuit. The circuit will indicate the level of 12V battery voltage through four LEDs. When the battery is fully charged all LEDs of the circuit will become activated, the LEDs will close one by one as the battery runs down. Each LED will close on power Calculating discharge time of 12V LED light ... You want to get constant current at 12V to run the LED's from 1.5V batteries. You will need a boost converter, as others have suggested, to raise the 1.5V to 12V. Power conversions are not ideal, and all voltage changing devices consume waste some of the input voltage doing their job. Battery Powered LED Strips SIRS E When the battery packs are fully charged, the voltage rises up to 12.6 volts for a 3 cell battery, which is plenty of power to adequately power up an LED strip which is rated at 12 V DC. Run Time You’re probably wondering how long the battery will power the strip. 30 LED Projects Talking Electronics Two LEDs can be driven from the same circuit as one LED will be illuminated during the first half cycle and the other LED will be driven during the second half of the cycle. LEDs can also be connected to the mains via a power diode and current limiting resistor. Circuit design to run LEDs on AA battery | All About Circuits I think the output of a Joule Thief is only a few mA and keeps dropping as the battery runs down. A current limiting resistor is not needed because the max current is already limited. Two different LEDs would each need a current limiting resistor that will reduce the already low output current then each LED will be dim. Circuits From Scratch | Let’s Put LEDs in Things ... If your design uses multiple LEDs, and if the battery and LED voltages allow it, connecting in series like this is slightly more efficient, helping the battery run longer. LEDs in series (like above) can share one resistor for the chain. LED Macro Light DIY: 5 Steps (with Pictures) If all LED's are in parallel you need approx. 1 3 to 1 2 Amp and would run down batteries faster. If you use a voltage boost circuit similar to a "Joule Thief" with about 18 volts out and put all LED's as 2 series parallel circuits the current could drop to around 60 miliAmp total. How long can a AA battery power a LED? | Yahoo Answers An LED typically draws around 30mA (I assume you're not using a very bright one). So if you have a 3000 mAh AA battery and you're drawing 30mA, expect it to last 100 hours. So if you have a 3000 mAh AA battery and you're drawing 30mA, expect it to last 100 hours.