Battery? or starter? or what?

Quick check:

1. Turn ON headlights... dim or normal?
If dim, then the battery needs charging.
2. With headlights ON, try to start and notice headlights..
If they don't change, then it's probably the starter.
If they dim a little, the battery is low
If they turn off, or go really dim, then the battery cables need to be cleaned. use a battery cable cleaner brush ($7 AutoZone) ($1.09 at Dollar store) to clean the cable clamps and the battery posts.

If they were dirty, try to start now (without boosting)>>> It will start!

Hope this helps!

Clicking is usually a frozen starter. But it could very well be the battery. The only way to know for certain is to remove the two and take them to a auto parts store that tests components. Sorry, not much of a solution.

Good luck,
matt