Help mates. I need an automatic shut off charger. It will stop charging if the battery is full, a 12V battery. Just like in mobile phones. The battery im using is a motorcycle battery,dry cell. Ill be using this in my new project.

 

You looking to build or buy - sometimes buying is easier but if size or other factors are constraints from purchasing off the shelf then build it yourself.

http://www.electronicsforu.com/EFYLinux/circuit/feb2005/Circ01-Feb05.pdf

You will need to adjust the output to charge the 12 volt battery.

http://www.national.com/ds/LM/LM117.pdf

 

Motorcycle batteries are typically flooded lead-acid types, and are not suitable for deep-cycle applications. They would not last long at all.

What is the manufacturer of the battery that you are considering, and the part number or model number of the battery?