Wholesale FON-1203B 12V 3A Smart PWM Charger for AGM, GEL and SLA Lead Acid Batteries. The FON-1203B is a 12V 3A three-stage PWM battery charger for AGM, GEL and SLA lead acid batteries. It is equipped with multi-protection functions and charging indicator, ideal for vehicle and solar battery charging & maintenance. Product Features ✅ Three-stage PWM charging: constant current, constant voltage & trickle charge✅ Battery line detection, short circuit, overcurrent, overvoltage