Looking for ideas.

Got in my car this AM and the engine would not turn over. When I turn the key I heard a fast clicking souind.

Lights come one , door locks open and close.

Today I come home from work and figure I try her again after checking the battery connections,

1st try nothing just the clicking
2nd try she turns over slowly and starts.
The way it turned over seems the battery was weak.
3rd try turned over slowly and started again So I'm thinking weak battery

I'm going to pull the battery and have it tested but am wondering why I would have lights, warning beeps and power door locks with a battery so weak it barely turns the engine over.

Anybody have any ideas?

 

The lights, and other accessories dont require as much amperage as the starter.. They will work, sometimes work normally. But the starter wont. You'll get the rapid click click sound. Have the battery tested, and the alternator as well.