Battery or Alternator problem?

One day, bigla nalang walang power yung battery ko, hindi nag start / redondo.
so gumamit kami ng ibang batt to start, ok naman, changed it to the other batt para ma charge, then tried to start it pero wala nanaman, hindi nag charge yung battery ko.

Hindi ba pag alternator prob, pag inalis yung isang terminal sa batt while engine is running, mamamatay makina? pero this time hinde eh.

Could this be batt problem na? basically hindi nag cha-charge eh, pero less than a year palang batt ko.

I'll go to electrician within this week, if my suggestions po kayo thanks sa input.