A healthy car battery with a 50 amp-hour equivalency rating should be able to charge any of the Samsung Galaxy model cell phones about 20 full times and an iPhone model around 30 full charges while still being able to start the vehicle. Double the number of charges if the car battery is being fully drained. Each make and model of cell phone is Charged my 6 Plus with the 12 watt charger, as the battery got closer to 100% the charge rate started slowly dropping, but the phone maintained a draw greater than the 5 watt charger is capable of providing up until it hit 90% where it dropped to 6.5 watts of draw (from the wall) same as the 5 watt charger it comes with. Users will also need a power adapter that supports charge rates of 9V at three amps. Users can take advantage of the higher charging speeds with most modern 30W or higher charging bricks. 26 Comments Your brand new $1,000 iPhone XS (or slightly cheaper iPhone XR) comes with a charger in the box, but it’s not very good.According to Apple, the iPhone 8 and anything newer than that phone For example, the counterfeit iPhone charger is advertised as supplying 1 amp, but has the 2A charger type, so an iPad will expect 2 amps but not obtain enough power. On the other hand, the counterfeit iPad charger claims to supply 2 amps, but really only supplies 1 amp and has a 1A type. Almost all modern cellphones and many other LiIon powered devices use the "USB" 5 Volt input charging standard. When the available charge current is less than the maximum some devices will not charge, but the majority of "5 volt input" devices will accept whatever current is available. A typical smartphone battery has a capacity of ABOUT 1500 mAh. .

how many amps to charge iphone