Intelligent repair charger $ 22.65 Microprocessor Control (CPU). 4-STAGE AUTOMATIC CHARGING: This is a fully automatic battery charger with 4 charge stages. Automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely. 4-stage charging is a very comprehensive and accurate charging process that gives your battery longer life and better performance compared to using traditional chargers. 4-stage chargers are suitable for most battery types including Calcium, Gel and AGM, Wet batteries. They may also help restore drained and sulphated batteries. Types of batteries: Most types of lead acid batteries including Calcium, GEL and AGM, Wet , SLA,EFB, etc.. Switchmode technology: Yes Polarity protection: Yes Output short protection: Yes Non battery link protection: Yes Over voltage protection: Yes Over temperature protection: Yes Cooling:Natural convection Input voltage: 100-240V AC, 50-60Hz Rated output: 12V DC, 5A Minimum start voltage: 4.0V The 4 stages are:Desulphation ;Bulk;Absorption and Float. Battery range: 15-100Ah Thermal protect: 65'C+/-5'C Efficiency: App. 85%. Dimension (LWH): 1807055mm