How long can a 9v battery power an led

Note: If you can run your circuit off of 3v instead of 9v, you will get much better battery life. How long will one set of batteries last? This can be fiendishly difficult to predict! What sort of LED , which 9V battery ? I run the 12V string off of LR-44 .

How many LEDs can you run on one Battery anyway?

We ran 4 but more are sure possible!

FIRST - The other posters are probably correct in that you probably could run the 12V LEDs from 9V , albeit at reduced brightness. But they are making an assumption about the wiring of the LED (s) in the light. There are only two absolutes I can think of for this question: In identical circuits, twice as many batteries in parallel will run for twice as long.

Batteries discharge constant power , together. Here at HitLights we sell battery packs to power our strips and LED products. A little more complicate however, is figuring out which battery you nee and how long it will power your lights for. Here is the question: I would want to. Developed for my quadcopter this little light design is wonderful Please comment on what you think.

Each LED is going to dissipate 1. Our fictional 1 efficient converter will draw 3. The required voltage drop is four volts, as the battery provides nine volts and five volts is needed to power the LED. Putting the voltage drop and an example LED current of milliamps into the equation gives: = 0. I will only be using one color of the RGB lights. A little bit of Info on battery voltages and stuff about LED strips a. Assuming your fan will reliably turn on as you state, and assuming your battery can supply enough current for the LED and Fan, this will provide the functionality that you need.

When battery is connecte LED lights up. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage .