First to first understand you of career, if you is daily are to travel or out of people, so you need purchase a a business type of mobile power, what is business type of mobile power does? actually said understand points is big capacity of mobile power, you often to out, or travel so to himself phone charging of opportunities on rarely so to purchase a capacity than larger of mobile power. Such as 10000-20000 most appropriate at this stage, there will definitely be asking so much, okay? can of course only the size is too big to move power on security risks, so it's best to buy in a security capacity in the context of more reliable.
Secondly if you are Office workers seldom go out only with a mobile power supply, such as a day out hiking, or Chinese lunar new year back home, just in case of mobile phone battery temporary 5000-10000 Ma power supply is OK. Don't need too much, because power there is a drawback, larger larger capacity, in order to buy the interval size has a capacity for carrying convenience.