How to ensure LED gets 700 amps with a 3.7 volt battery?

[phook15]

I'm using a luxeon rebel star(blue) which needs 3.4 volts and a 18650 3.7 li ion battery at 2800mah.

[Silver Serpent]

I'm hoping you mean 700mA. 700 amps would incinerate your wires, to say nothing of your LED :)

Rebel blues can be run safely at 1000mA (or 1 amp), see here for how to calculate a resistor: http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law

You could also use a 1000mA or 700mA buckpuck, but that will need a minimum of 5v from your power source.

[NanoRex]

I highly recommend that you read up on Ohm's Law and watch/read a lot of tutorials before you create any more threads. The questions you're asking are quite silly and have been answered in many many other places.

[phook15]

Sorry, I'm really bad with electronics.

[darth_chasm]

Its ok. Everyone has their own speed at which they learn. The suggestion to take your time and read is a sound suggestion. You have been getting some terms and concepts mixed up, so time spent researching and learning will be time well spent. Good luck.