What's the best way to to charge an iphone from a 12v battery. Using an power inverter so going from DC to AC back to DC? or using a 5v voltage regulator?
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Not sure I know what you mean!!!!A car charger. USB charging can be funny, as the phone may need to "request power".
The Iphone won't charge itself when plugged in to a USB port unless the hosting device tells the Iphone it's allowed to.Not sure I know what you mean!!!!
I have been successful doing this same thing by simply using a 5 volt regulator. It may be interesting to note that if one happens to have a "spare" usb charger and is willing to sacrifice the micro B or one of the end adapters, it is only necessary to connect wires 1 and 4 to the positive and negative contacts on the phone or battery and simply plug the othe end into a computer or some 5 volt dock for an unspecified period of time to achieve a full charge. In this case neither an inverter or regulator is required. However if you so desire to use the 12 volt battery a voltage regulator of not less than 5 volts is a must. No "fast charge" from higher voltages here! I learned this the hard way when my charger malfunctioned and in order to charge the battery cell I used the stripped down USB cable quite successfully until payday allowed the purchase of proper gear. No ill-effects were observed and I later resoldered the USB cord and restored it to normal. Let me know how it goes. note: if you have a multimeter handy you may monitor the rechatging processs in real time in order to not exceed the cells reccommended milliamp spec. TigersharkWhat's the best way to to charge an iphone from a 12v battery. Using an power inverter so going from DC to AC back to DC? or using a 5v voltage regulator?
From 12V down to 5V? I suggest using a step-down converter for that. It's going to be a lot more efficient than simply frying the 7V over a linear regulator.What's the best way to to charge an iphone from a 12v battery. Using an power inverter so going from DC to AC back to DC? or using a 5v voltage regulator?