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Assuming that the battery is clean, the battery terminals are not corroded, and the electrolyte level is good... you HAVE checked these, right?

If the battery does not have enough power to crank the car under normal circumstances, there are a couple of basic things that can happen. Either the battery is not being sufficiently charged, or something is allowing that charge to drain away. You say that it is charging back up, so it must be that something is allowing the charge to dissipate. It's either internal to the battery, or external - meaning some part of the wiring system connected to it. Internal usually means one or more shorted cells, and a new battery is in order. External (within the wiring) is most often something left on, like lights or some new stereo amp, etc., or a problem with the alternator. Sometimes one of the diodes inside the alternator can short out and provide a current path which will drain the battery. And most times, a single failed diode will still allow the alternator to charge when running. It doesn't charge as well, but you won't be able to tell that without test equipment.

Generally speaking, an auto parts store will be able to test for all of these problems quickly and easily, and most will do it for free. Park up front, next to the storefront, and just go in and ask.
 
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