Hyperion PSU question

Hey all,
I wondering if my old pc psu i converted into a charger psu will be able to charge a 6s 5000mah at 1C. The PSU is a 12v 15 a and i will be using a HYPERION EOS0610I charger. If not whats the min wattage i need at 12v to charger the battery at 1c?


I was thinking that the battery needs 111 watts to charge and hopefully ill be getting about 75 percent efficiency that's 138.75 watts which is within my psu specs. Is this correct? Would a 300 watts pc psu work?
Thanks