With ChargeSafe, we provide 5V/2A charging output for each locker (not each cable). The charging speed is depending on your phone, including(but not limited) battery capacity, battery remaining capacity, system version, Quick Charging supported or not, power on/off status etc.
Note that if you charge two phones in the same locker, the charging speed will be slower than just charging one phone, because the maximum output per locker is 5V/2A. So, if you are going to charge two phones in the same locker, you are suggested to use one locker per phone, or select longer charging time like 60MINS or 90MINS if just use one locker.
In order to get a faster charging service, we recommend you power your phone off during the charging. And you are also suggested to update your system to the latest version which usually has a better charging solution.
Declaration: The percentage reference on the “CHOOSE TIME” page is calculated based on cell phones with battery capacity of 1500mAh(like iPhone 5S) and charging at power off status. And the final charging speed is depending on factors mentioned above.