Designed for 12V LiFePO4 Batteries: This smart battery charger delivers a 14.6V DC charging voltage and 40A charging current. Fully charge a 150Ah battery in just 4 hours (Note: Not suitable for lead-acid batteries) 4-Stage Intelligent Charging Curve: Our LiFePO4 battery charger auto detects your battery's status. Precharge stage: wake low-voltage battery, CC stage: rapid charging, CV stage: avoid overcharge, T4 Battery Full Stage: the output cuts off on till another battery has been connected 0V Secure Activation Function: No extra tools required! With the 0V activation feature, you can efficiently wake up batteries in BMS protection mode. It keeps battery damage from prolonged low voltage and easily charges low-voltage lithium batteries Security First, Protection Always: Our lithium smart battery charger is tested to FCC standards