Michael Potuck - Sep. Fast charge iPhone and iPad with MacBook chargers? Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter , Facebook , and LinkedIn to stay in the loop. Check out our exclusive stories , reviews , how-tos , and subscribe to our YouTube channel. So the conclusion is that either your charger was faulty and its output voltage was greater than 5V, which would cause push a greater current to flow than the load device was capable of; OR your load device phone, etc.
Bottom line is that when all devices are functionally sound and non-faulty, it is impossible for you to burn it out by using a charger that has a higher rated wattage. Using a charger with a lower rating can cause the charger to overheat and maybe fail as the load device will attempt to draw the charge current that it needs but the charger can only supply the maximum it is designed to supply.
So, for example, if you have a charger that can supply only mA 5V i. So, Ohm's Law applies again. Let's once again assume that your load device is 5 Ohms. So, if you draw too much current, the voltage will drop. Take the extreme: if you shorted out the charger terminals, the short circuit voltage is 0V and the short circuit current is 0. Loads, such as a phone, draw as much current as required for their resistance see Ohm's Law. Having a power supply that can supply more current than a device can use is not only possible, but basically universal.
A MacBook charger can supply 65W of power max at a constant voltage, this implies constant max current , but most of the time the MacBook will be drawing FAR less power and thus less current.
It will not "hurt" your iPhone, however with long term use and everyday charging with the larger amperage, you will damage your battery faster and it will start performing worse more quickly than it would normally. I recommend charging your iPhone with the standard 1 amp charger that is included with your iPhone. However, if you're in a pinch and need some extra battery fast, then using a larger amp charger won't destroy your iPhone.
The iPhone does not need 2. People claim the iPhone is designed to handle more than 1 amp of power, such as the iPad's 2. Just because there is a cutoff at the amount the iPhone will accept, not sure what it is just over 2. The power management chip and battery has to work with more power. Yes, Apple lists that the iPad charger is compatible with your iPhone. It does work, and won't cause noticeable harm for a while. Also, worst case scenario for Apple is you go and drop more money on a battery replacement.
More heat and more power is never a good thing, and will cause long term damage and poor battery performance, with the possibility of other things failing faster.
Anecdotally and with confirmation from Apple , iOS devices charge much, much more quickly with a higher-watt wall brick. The difference between either of those chargers and the 5-watt charger that comes with an iPhone will be just as dramatic.
An iPad charge brick is rated to handle 2. The actual amperage is determined by the load i. According to Steve Sandler, founder and chief technical officer of the electronics analysis company AEi Systems, modern battery-powered electronics have a lot of complexity between the charger and the battery, including battery-charging circuits within the device and battery-protection circuits in the lithium-ion battery itself.
These circuits are designed to manage the flow of electricity to the battery, and if the circuits inside the iPhone were designed to tolerate 1 amp, but are routinely exposed to 2 amps, that could stress the system over time. All you need to do is check the top or bottom of the adapter. For one, your iPhone has an intelligent charge controller installed. This takes about 3. With a 10W adapter, on the other hand, you can fully charge your iPhone in 2 hours and 20 minutes. With this, you can get full battery life in just 1 hour 40 minutes.
The 20W adapter, with its high wattage, is the fastest option for your iPhone. This can fully charge your device in an hour. The caveat here, however, is that you can expect a slower charging time.
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