'06 Yaris wont start, clicking noise

[phillidg]

My '06 Yaris will not start. I hear a rapid, repeating click. I started the car with a jump, drove it around for about 45min and then pulled back into my driveway and turned it off. It wouldn't start after that. I know the battery isn't charging, but is there any part of this that would decide which electrical component isn't performing?

[CTScott]

It is most likely just a bad battery, but it is worth checking the alternator before spending the money for a battery.

Once you jump it and get it running measure the battery voltage. If the alternator is functioning properly, you should see 13.7 to 14.3 volts. If you turn the headlights on with the engine running it should not sag to below the mid 13's.