VMAX (CT5000) 5000WRMS / 10,000WMAX AGM AUDIO SYSTEM CHARGE TANK SPECIFICATIONS: Nominal Voltage: 12V 20Hr Capacity: 210AH Burst Amps: 4500A Terminal Posts: 8mm (included) Charging Current*: 15A-60A Charging Voltage: 14.4-14.9V Float Voltage: 13.5V-13.8V Weight: 113lb Dimensions: 20"w x 6.8"d x 9.5"h RECOMMENDED CHARGING OPTIONS: AC Chargers: Any Quality Brand AGM- Smart & Microprocessor controlled- charger with the recommended specs above can be used. Vehicle Alternator: 14V-15V. RV Converter: 14V-15V. Solar Panel: 250W-900W. Wind Turbine: 250W-900W. Charge Controller: 40A-UP. * Warning: Do not use a charger with smaller amperage than the recommended Charging Current shown above. Maintainers should ONLY be used to maintain a fully charged battery but NEVER as a charger. OPERATING TEMPERATURE RANGE: Discharge: -4~140F Charge: 14~140F Storage: -4~140F TEMPERATURE COMPENSATION: Cycle use: -30mV/C Standby use: -20mV/C