lead acid(12v) battery charger

[ssingh]

I need to build a charger circuit for 12 volt lead acid(6 cell) battery of 50 ampere hour. the charger should charge at a constant current upto 70% of the battery full voltage and at 2nd stage is toping charge(2.4 volts per cell) which involves constant voltage and at the 3rd stage it should involve float charge(2.25 volts per cell), which compensates for the self-discharge. please help me out to make this charger

 

[pnjbtr]

Try this(https://www.edaboard.com/threads/187093/