^^ I've experienced that before, click-click lang, walang redondo, malakas busina, umiilaw and all. nung umandar dinala ko sa tindahan ng battery and pina-tsek ko batt and alternator, okay alternator, battery on it's way out.
I don't know what caused it, my battery is well secured and all. so mas maigi dalhin mo talaga sa supplier ng car battery at ipa check mo.