I have a 12V 7.5Ah SLA battery and L200 IC constant voltage charge circuit. My voltmeter shows me 14.5V witout the load.I connect the circuit to the emtpy battery i see 11V and when the battery is full 13.9V. I think everything is normal for this charge technic. Because i use constant voltage charge.
Sounds good, but if you can get the no-load voltage down to 14.2 would be perfect.

But I don't know what should i do if i use boost type charge. Please correct me if i'm wrong:
-Pic will control the battery voltage for charge status. I think this is easy.
-How can we udjust the i.e LM3588 with a pic ?
The LM2588 has its own adjustment with resistors, something like the LM317s. Set it as close as you can to 14.2 and that is all you need. For the straight charging, a PIC is not needed if you use LM2588. My main battery bank will go from 11.5 to 14 volts, (400 amp/hr). My chargers built around LM2588 to charge the small batteries will bring them up to 14.2 and hold them there. You could use a PIC to monitor this and when 14.2 is reached the PIC would shut the LM2588 off.