When you are asking how many times a 2600mAh power bank can charge your phone, there are 2 key information you will need to know:
1. The battery capacity of your phone;
2. The conversion rate of the power bank.
Let’s take the power bank above and an iPhone 6 as an example: the battery capacity of iPhone 6 is 1810mAh; most decent power banks are about 90% efficient; so a 2600mAh power bank can full charge an iPhone 6 one time and fill another 30% power. The estimated charging times for other types of phones are as below:
We can obviously see from the above that a 2600mAh power bank is not enough to fully charge a smartphone we use most. If you need to bring an extra battery portable with you, a 5000mAh one will meet your needs for at least a single charge. Anker PowerCore 5000 power bank [Buy at Amazon] is able to fully charge your smartphone for at least one time and the super slim size with a built-in cable make it convenient for you to bring anywhere you go.