Question on charging 12v car battery with step-down transformer, safety issues
I have an AC->DC step down transformer that outputs at 12v (max 13v, can be adjusted with potentiometer). It is rated at 10A.
1) If I were to connect it to my dead car battery would it even charge? If not, how should I go about charging it from the mains?
2) If it charges, would it charge safely? If not, do I need any resistors or fuses?
3) How should I monitor the charging or know when it's good enough for cranking?