What battery should i use?
The lights I have are 5mm, 3-3.2 volts, 20mA-30mA. I want to wire the lights in a parallel circuit for each one. I want the LEDs to be bright! They are rated at 2,500 mcd @ 20mA.
-I need a battery that is a very small battery less than 1"x1"x2" or very close to that.
-Also is it possible to use a battery that is a 3.0 volt battery that is something like 2000 mAh
- I did the math and it seems that my mAh is 560 because (20mA)x(28 LEDs)= 560 mAh. Is that right? if so could I use a battery that is 3 volts and 2000 mAh and have a battery life of 3.5 hours? because 2000/560. is that right?
So in a summary, I need a small battery powerful battery that can EQUALLY light up 28 LEDs and if so what kind of resistors would i need if I use a battery that is 3/ 6/ 9/ 12 volts.
Also do i need to have a resistor for each LED light or can i have one at the end of all the parallel circuit?