... : 2A~4.2ACharging time: 5~10HUsing time( laptop computer): 4~7HCycle life: Up to 500timesAmbient temperature:10~40°CSize:190* ... bus, boat, ect. High safety, good compatibility, small size, long life, effective cost, it can charge ipad, iphone as well. Usage ... it's acceptable.11. Range: 70W below laptop computer. high capicity portable mobile battery for laptop Power-Pond-12c , mobile etc other device ...