... key: when insert long IPHONE according to the "3 seconds" for the mobile phone charging, again long press "3 seconds", turn ... plug in IPHONE4 when a current long press "3 seconds" for the external battery, long press again, switch to IPHONE4 built ... battery remaining power, charging different state, different mode charge.Indications for charging status:The battery voltage: 25% of the electricity the ...