According to my point of view power bank now become more important to buy for everyone for purpose of any emergency recharge
If you are think to buy a power bank then first of all I check the best company which give me best service because if your power bank is damaged after some time then company thus not take any worrenty thus first of please check the best company who have best service .
Any second is price most of online site and company sell their fake power bank on low price so guys please check the best price on best site and does not buy any same product on such a low price only original product is avilable on actual product site or popular selling site like flipkart etc .
It must be port atleast 3 or 4 phone and charging capacity must be required high and fast . Because it is more important to me.
All these tip must be important while purchasing the power bank