Help powering LED lights?

I have 2 LED lights i need to power. I bought a package of 2.8 volt and 1.8 volt. I will be using a switch to turn them on and off. I'm not really sure what i can use to power them. i bought a battery pack that holds 2 AA batteries but it doesn't seem to be enough. I am making a T800 terminator skull.... show more I have 2 LED lights i need to power. I bought a package of 2.8 volt and 1.8 volt. I will be using a switch to turn them on and off. I'm not really sure what i can use to power them. i bought a battery pack that holds 2 AA batteries but it doesn't seem to be enough.

I am making a T800 terminator skull. Any help or suggestions would be great
Update: I haven't done anything with them yet. I just bought them and took them out of the package. I have not bought resistors but I will do that.
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