•3 stages of automatic charging: This is a fully automatic battery charger with 3 charging stages •Automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely •The 3-stage charger is suitable for most battery types including calcium, gel, AGM, wet batteries. They may also help restore drained and sulfated batteries Specification: •Switchmode Technology: Yes •Polarity Protection: Yes •Output Short Circuit Protection: Yes •Non-Battery Link Protection: Yes •Over-voltage Protection: Yes •Over temperature protection: yes •Cooling method: fan •Input voltage: 100-240V AC, 50-60Hz •Rated output: 12V 8A, 24V 4A •Minimum startup voltage: 2.0V •Battery range: 6-150Ah •Thermal protection: 65℃+/-5℃ •Efficiency: about 85% Package included: •1 x Battery Charger •1 x English User Manual