I am trying to use a 3.7 Volt 1 Amp (so it's 3.7 Watts) Lithium Polymer battery to charge or at least trigger the charging symbol on an iPhone 5. I have charged the battery fully using the Lithium Polymer Battery charger. I plan on connecting the black and red wires on the battery with the black and red wires inside a lightning cable. Then, I will plug this lightning cable into the phone. I do not care how fast or how long it takes to charge the phone. I would just like to know if it will at least trigger the charging battery symbol on the iPhone. From what I heard, 2.5 Watts to 5 Watts with 1 Amp is enough to charge an iPhone 5, but I cannot find anywhere whether the iPhone detects this charging. I know my USB port in my older 2006 PC which only gives off 2.5 Volts can trigger it, so I believe a newer battery can easily do it. All help is appreciated.