I'm familiar with the 'battery' theory that people are putting forward, but the problem isn't battery or alternator related.
Most of us have experienced the "click click click" of a flat battery, but this isn't the case here.
Re-read the post.
From what i can gather, the noise he is refering to is occuring while the motor is going.
If this is the case, then yes, it's most likely the lifters.
You say that you used 10w-30 when you did the oil change....... it sounds like the oil you chose could be too thin.
Maybe try using 5w-50
Otherwise once the oil heats up, it will run off all the moving parts instead of staying where it's needed.