Asked 11 years, 1 month ago. Active 7 years, 5 months ago. Viewed 12k times. Is there any harm in using the iPad charger for iPhone 4? Improve this question. Nathan Greenstein Raj More Raj More 1, 10 10 gold badges 26 26 silver badges 38 38 bronze badges. I swear I asked this same question earlier this week and it was flagged as a duplicate This question was asked 18 months ago. It bubbled back to the top because stuffe added a new answer.
And because I happened to see that Knowledge Base article a few days ago, I added mine. Add a comment. Normally, iPhones come with a 5-Watt charger that is rated to handle 1 amperage. However, it takes a lot of time to charge phone using conventional charger. So users always come up with a query: can you charge iPhone with iPad charger? An iPad charger also provide similar range of voltage that is suitable for charging iPhones. Nevertheless, users also wonder if it is bad to charge iPhone with an iPad charger.
So, here we have listed down few benefits of using an iPad charger instead of original iPhone charger. The major benefit of using an iPad adapter to charge your iPhone is fast charging as the conventional 5W adapter takes hours to power up the battery.
This helps in saving your time as well as you do not need to keep your device plugged-in to the charger for longer period of time. The charger is actually built inside the phone or tablet which is responsible for regulating the current to the device.
Now with this knowledge you can be assured that the battery will not be damaged if charged with an iPad adapter. Well, this is not true. Currently, I am using an iPhone 3GS mini charger. It charges the iPad but only very slowly when the iPad is on but the display is off.
However, since the iPad is provided with a lower current the charging takes longer. This is why it takes longer to charge. You should completely turn off the iPad in order to speed up the charging process.
The 5W, 10W and 12W chargers are all capable of charging an iPhone. The wattage is made up of two variables - voltage and ampage or amperage if you're American. All three chargers have the same voltage output 5V , the difference comes with the amp output 1A, 2A and 2. For the sake of argument, let's ignore the voltage because it's not really relevant to this discussion seeing as all the chargers give out 5V. When using a 5W power supply to charge an iPhone, you will be drawing the maximum current available 1A.
You will NOT charge your device any faster. A higher-rated power supply will NOT damage your device, because the device will only draw as much current amps as it needs. The charger will not force the little electrons into the device any faster than it can handle.
On the other hand, if you put a higher-rated device on a lower-rated charger you will get the following results:. Your device will take a LOT longer to charge. In fact, it may appear not to be charging at all. Experiment for yourself: plug a new iPad 4 into an old USB 1. You've heard of "trickle charge" right?
This is where the current being fed into the internal battery isn't actually enough to properly charge the battery. The battery will be discharging power at almost the same rate at which it is charging. Yes, this will damage your battery over time. You saw it a lot in the original Nokia USB-charging phones - the batteries died after a few years and would no longer maintain charge. There's nothing wrong with doing this as a once-off, for emergencies, or on an irregular basis, but you will do progressive damage to your device if you keep doing this.
At home I have an iPhone 4, 4s, 5 and iPad 4. They all get charged off the same power pack - a 12W 5V, 2. All of my devices charge, none of them have been damaged.
What is wrong with all of your analogies is that the "charger" for iPhones and iPads is not a charger at all. It is a 5 volt DC power source. The charger itself is inside the device.
The internal charger regulates the charging current to the battery. For car and motorcycle batteries the charger is external. Thus, the external charger must regulate the charging current to prevent damage to the battery.
Sep 7, AM. Actually, I realize I was a little unfair. Your analysis is correct up to the point where you say "now lets talk iPhone". The problem is you don't understand that current is a measure of the maximum capability of the charger to supply current, not the amount that will be forced on the device.
Sep 5, PM in response to emfung In response to emfung. Their was another post about this charging issue and I explained it all basic on my educational level with electronics. Their were some people who turned it into and utter and complete joke. As the post went on a couple people that were using the iPad charger on their iPhone ruined their iphone battery.
Once these people started posting that these people stopped with their stupid replies. I can get really technical with formulas on this but I will go with a very simple one. All Apple chargers are 5 volts. Amps is the amount of current flowing into your device to charge your battery. Charging your battery is best to get the most out of it but who would want to plug their new iPad into their PC and wait 24 hours for it to charge???
No one, not even me. Despite it saying "not charging" on the screen plug it in your PC overnight and remember what you started off with, turn off the screen, let it go for 4 hours, and YES it will charge at a VERY slow rate. The screen says not charging, but give it a try and you will see that it did charge up but very little. So with their 5 volt charger 2. Pretty amazing how they achieved that many mAh just by making it slightly thicker. Very technical how it was done but not for this discussion but it is almost double capacity.
Now you see the problem? Will it work Yes, but you are over charging forcing to much current your battery. End result you are decreasing the life of your battery. Apple says you can use any charger and you can see above a simple formula in simple math. So why would you use a charger that is 2. Does anyone know what the cost is for Apple to put a new battery in your phone? I am curious on that one and would guess its not cheap.
Their is a formula in simple math. Can you use the ipad charger on your iPhone? Will it shorten your battery life using the iPad charger on your iPhone?
Sep 5, PM. The point under discussion is whether or not the iPad "charger" is harmful to lesser devices. I believe that Apple employ extremely well qualified people who check the facts before Apple puts the following into every Apple Store on the planet.
Look up the iPad charger for yourself, and consider which side of the argument carries more authority. Sep 8, AM. As I biomedical engineer, I can affirm that Mr. Finch's analysis is correct. FWIW, this is a very simple engineering question which doesn't require debate. I'm very impressed that you were part of the team that designed the first electronic landing system for the USS Kitty Hawk.
That's really cool! Also, Merlin has confused mAh and watts in describing the capacity of batteries--watts are a unit of power. One can compare mAh and watt hours.
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