The biggest use of mobile power bank is to charge your phone, so the primary thing to see is its calibration power. The greater the power, the more the number of charging.
The greater the capacity the better? A matter of opinion. In general, the mobile power bank can give your phone full of 2,3 times electricity, enough for your daily use. IPhone 7 only 1960mAh, 8000mAh mobile power bank enough.
More than a power, on a more weight! one 10000mAh mobile power bank to more than a pound, so consider your needs, good enough, do not pursue too much capacity, while ignoring the weight of the pressure on your shoulder.
In addition, when we travel will bring mobile power it, too much power, your mobile power bank may not be on the plane.
3. Will explode?
Often see the mobile power bank explosion, burning. Many people will worry about their mobile power bank will not be hidden grenades, after all, even the international manufacturers Samsung battery can also explode, but also fried non-stop.
Can be the problem comes from the outside, you can not tell the battery is good or bad, only through the instrument detection.
So you need to find a large manufacturer of mobile power.
4. Choose large mobile power.
At least in the batteries with security quality assurance.
Cottage no-name does have the ability to use, but identify them is not to use second-hand batteries, virtual standard capacity, virtual standard output capacity, really a lot of trouble, genuine is not expensive.