... electrical energy and stored in the built-in capacity of 2600mA / h lithium battery and then in the case of the built-in lithium battery power ... :Method 1,Electricity (AC100V-240V) or computer USB to the built-in rechargeable lithium battery, light green, about 5.5 hours can ... 2,Solar charger, place under the sun, can the internal built-in battery charging, the green light is charging, can be filled ...