Have the alternator checked.
the battery could have a dead cell, this could cause it to not charge. Have the battery tested to be sure.
dead battery
Weak battery? Loose or corroded battery cables? Starter solenoid?
Use battery load tester and properly test battery. When battery fails, replace it.
Weak battery, corroded or loose battery cables, failed starter.
if clicking but not starting dead battery if it starts it's one of the many relays that open and close during startup
Dead cell in the battery or corroded or loose battery cables.
Its a sign that either your battery or alternator is starting to fail.
the starter may not be good or the connection on the starter may be loose
Clicking usually is a sign of a bad battery or starter
Check your battery terminals one is either loose or the grounds are bad.... On the firewall.... The clicking is the starter not getting enough power... No Clicking means no power or bad starter..Or you killed the battery(no power).. Google starter problems etc...
check if your battery is low than usual ..might be alternator problem