Charge Specifications: Recommended Charge Current - 20A or 50a Max Maximum Charge Current - 60A Recommended Charge Voltage - 27.3v - 27.7v BMS Charge Voltage Cut-Off - 24.5V Reconnect Voltage - 24.9V Balancing Voltage - 27V Safety and Protection Specifications: Case Material – ABS Terminal Type – M8 Built in Automatic Battery Protection System - Internal Automatic Low Voltage Disconnect - 22V Automatic Short Circuit Protection - Instant Automatic Over Voltage Protection - 28.5V Automatic Reverse Polarity Protection - Instant Flame Retardant Electrolyte - Yes Length Way Circuit Boards - Yes Automatic Internal Cell Balancing - Yes Automatic Fault Recovery - Yes Explosion Proof Stainless Steel Cells - Yes Temperature Specifications: Discharge Temperature -20 to 140 ºF (-20 to 60 ºC) Charge Temperature -4 ºF to 113 ºF (-20 to 45 ºC) Storage Temperature 23 ºF to 95 ºF (-5 to 35 ºC) BMS High Temperature Cut-Off 176 ºF (80 ºC) Reconnect Temperature 122 ºF (50 ºC)