30w
Analysis: To calculate electrical energy, you need to use the formula "electrical energy = voltage X current X hours". 30000 mAh should refer to the external battery, the capacity is 30000 mAh = 30 Ah. 1 kilowatt hour = 1000 watt hours = 1000 Wh = 1000 VAh
The 30 Ah of the battery corresponds to 30 A*h, which is a unit of electricity that can be obtained by charging. continuously for one hour with a current of 30A, or with a current of 1A, the battery can be charged continuously for 30 hours. A battery is a device that converts chemical energy into electrical energy. It is called chemical battery, generally called battery. After discharge, the internal active material can be regenerated by charging – storing electrical energy as chemical energy; when it is necessary to discharge it, the chemical energy can be converted back into electrical energy. This type of battery is called a battery.accumulators, also called secondary battery.