Hello sir,I am a professional Embedded Designer with 15+ years experience in Digital and Analog fields, working with 8051,AVR,PIC,ARM,DSPs,FPGAs etc and rich experience in PCB designing(Eagle Professional version) and layouts, i have designed Various Constant Current and Constant Voltage Battery Chargers(For Wet Lead acid, SLA, Ni-CD, Ni-MH, Li-ion,Li-Po) for both industrial and Consumer goods using Linear and Switching topology, with current ranging from 0.1Amp to 100Amps. My charger circuit can extend your SLA battery's life. Also i have designed Solar Charger controllers,Battery De-sulphators etc. looking forward to do your project!