It could be a bad battery, or it could be a bad alternator, ground wire, dirty terminals, etc.
You need to test the components.
Charge the battery.
Then put a voltmeter across it.
It should read 12.5 volts about.
When you crank it, it should drop to about 10.
If it drops lower, the batter or starter is likely bad.
If it does not drop to 10, then the starter or terminals are bad,
If you stop cranking, the battery should come back up.
If it does not, it is bad.
Once started, then you should see over 13.5 when reved up.
If not, the alternator or terminals are bad.
Your battery is probably junk. remove it and take it to your auto parts store and have it tested.
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