Hi,
I'm currently trying to build a homemade dynamo charger (providing direct charge) for my IPhone 5C, I know the battery is 3.8 volts but not sure what the safe upper limit is, I have seen tables stating you can go 65% above safely but could do with some advice
Thanks,
Colin
iPhone 5c, iOS 9.3.2
Not sure what you mean by "direct charging"? The iphone itself regulates the charging of the battery, not the external power source. The lightening port itself is expected to be connected by a standard USB connector, which is 5v. So it doesn't matter what the external power supply is, as long as what is sent to the iPhone meets USB power standards.
People are using their 29watt MacBook power supplies to charge iPhones and iPads which works fine since the MacBook power supply outputs standard USB power, and the device itself will regulate current to the charging circuits and battery.
P.S. And bypassing the device SMART charging system with a lithium battery can be a really bad idea, as lithium batteries can easily explode or burn if you are not careful what power you feed into them. That is, in part, why the international SMART lithium technology standards even exist.
Hi Michael, thanks for the reply, by "direct charging" I mean having the charger directly plugged into the phone rather than charging up a slave battery. I wanted to know the charging voltages so I can fit a voltage regulator to control it. I understand the phone controls the input voltage but wanted to include a voltage regulator as an extra safety feature.
Just have your voltage regulated limit output to the phone's lightening port to 5v, the USB standard. That's what the port itself is designed to handle.
charging voltage limit
