After 1 Minute Hand Cranking When cranking 120 times a minute 18 mins light on High Mode/40 mins light on Low Mode. When cranking 90 times a minute 15 mins light on High Mode/20 mins light on Low Mode. After a full charge 4.5 hours on low lighting mode /40 minutes high level lighting mode. This lantern has fail-safes protects your lantern from overcharging, over-discharging and over-circuit, very safe in utilization. These lanterns can be emergency power bank also. USB outlet allows the lantern to power any USB device. You can hand crank the lantern to charge your device. 300mAh/3.7V Lithium battery .