Results The results are quite clear. Fast charging does not lead to significantly reduced battery capacity after 500 charging cycles on either iPhones or Android phones. Always using your smartphone in the “ideal” range between 30 and 80% capacity can result in a slight increase in capacity after numerous charging cycles. In the test, this amounted to 4% more capacity for iPhones and 2.5% more for the Android phones tested. Nevertheless, the tester’s conclusion was: it makes vi...