How you know is not the battery problem?

Last time when my car cant start, my other equipments still work. like opening the door and so.

Original proton. No headache. Buy from the Proton Parts Centre, or just head to places like Zordaq Motorsport where they carry original parts for Proton cars.

If you want to save a bit of cash, I'm not sure what to recommend you. Just stay away from Kayaba as it will cause your car to be lower than usual even when new.