Charging iPhone 5s with batteries?
Ok so I want to build a basic charger with a RC plane battery… Is this safe? WILL IT HURT THE PHONE?
As long as the battery produces exactly 5 volts and has a regulator circuit to detect when the phone is charged, and shut off the battery. I somehow doubt that's what you have. If so, don't do it. Instead, buy one of the many power packs available for this purpose at low cost (cheaper than RC plane batteries for sure).
Battery current is unregulated. The battery pack will have to have circuitry to control and detect charge rates and levels.
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