“iPhone 6 and iPhone 6 can also play the quick-charging game,” Elise Ackerman reports for Forbes. “Just plug them into the 2.1A/12W charger from an iPad or the high-power USB port of a newer model Mac. This raises the question, why doesn’t Apple advertise this feature? And, more importantly will it hurt your phone if you try this?”
“It is possible to deduce from the web page Apple created ‘Charge the battery in your iPad,’ that Apple is aware of this capability and endorses it,” Ackerman reports. “The Apple store lists every iPhone from the original ‘iPhone” to the iPhone 6 plus as being compatible with the charger.'”
“Isidor Buchmann, founder and CEO of Cadex Electronics and author of ‘Batteries in a Portable World,’ explains a key measurement that determines how much charge a phone can safely receive is the C-rate, or the rate at which a battery charges or discharges,” Ackerman reports. “To determine a C-rate, simply take the ratio between the charging rate and the capacity of the battery as measured in mAh or milliampere-hours. For an iPhone 6 that is being charged with the iPad charger, the C-rate is 2100mA/1810mAh or 1.16C. For an iPhone 6 Plus, the C-rate is 2100mA/2915mAh or .72C.”
“Most portable batteries are rated at 1C,” Ackerman reports. “This puts the C-rate that we calculated for the iPhone 6 and 6 Plus in the safety zone. ‘A battery manufacturer would recommend a rate below 1C,’ Buchmann said. But a rate that is just barely above 1C is nothing to be concerned about.”
Much more in the full article – recommended – here.