hi amindzo,

ok, i'll help on this one...
What you have posted is the outline to your project. People are not here to design a project for you, we are here to help with problems with the work you have done.

On that note however I'm gong to be helpful, what you need to do is to find the relevant information...
At what voltage to 12V lead acid batteries charge at?
At what voltage is the battery fully charged?
What is the normal 'standing' voltage?
How much charge current can they take?
How much charge current can you supply?
What is the manufacturers recommended recharge method?

What PIC are you thinking of using?
what voltage are you running the pic at and where is the power coming from?
Do you need any sort of visual indication of charge state? if so what?


Once you have that info you can the start search these and other boards for idea's, code etc...
You have to design it, and we can find the mistakes. But you've got to be able to do the legwork...