Some key things which you need to know before buying power bank!
Your personal requirement will determine which type of power bank you need to have. .
If you don’t travel much , or you don’t like to carry too many devices when you travel , then you can buy a small and low capacity just to charge your phone .
And if you travel too much and and carry many things like phone , tablet , ipad etc. Or you travel with your family and want only one power bank then it’s important to have one with higher capacity.
You should not buy a portable power bank which either uses refurbished batteries , or which does’nt contain the basic feature like short circuit , over charging protection.
And if you carry a charger with yourself it will add more !
1500mAh battery - mobile phone - 1 full charge
5200mAh battery - mobile phone - 2 full charge - tablet approx 50%
10000mAh battery - mobile phone - 4 full charge - tablet atleast 100% full charge