Ampere Test

Ampere Test is made to measure the charging speed of your device. It uses the only currently available method to do so, which is not 100% accurate but it is very close to that. It relies on iOS to report on battery charge status, since there is no other, more direct way to get battery information in iOS at this moment.

A test might run up to a several minutes, which depends on the quality of your charger and the percentage of your current charge (test on a battery with a charge higher than 80% will take longer)