The 12W adapter's charge is actually 12.48W (5.2V - 2.4A), and it posted some pretty good numbers! It always outputs its maximum, and its results are not that far off the fastest charging possible. The slow charging begins shortly after passing 80%, and trickle charging begins at 95%. In comparison, even the fastest charger possible will still give you 50% or so by the 30 minutes mark and 80% by the 60 min one. 12W (left) and 10W (right) Apple power adapter originally made for iPadsĪpple's 12W iPad charger is even better - it refills 43% of the battery in half an hour, 79% in an hour, and a full charge takes 1 hour and 40 minutes. This 10W adapter charges at its nominal power output of 10W and after 30 minutes drops to 9W. It will recharge 32% of your battery in 30 minutes, 61% in an hour, while a full charge takes about 2 hours and 20 minutes. If you have Apple's 10W power adapter from an old iPad, you can do even better. The charger gets hot at the beginning, and that's the reason - this small thingy outputs more power than it is rated at as long as it's an iPhone that's connected to it. Surprisingly, the 5W Apple adapter, in fact, outputs 7.5W (5V, 1.5A) when you connect an iPhone - at least for the first 30 minutes, and then it slowly tapers off to 5W. An hour of charging gets you 38%, while a full charge requires almost 3 hours. If you have a 5W Apple power adapter complete with a Lightning cable, you can use them to recharge 19% of the iPhone 12 Pro's depleted battery in 30 mins. However, the caveat here is that the charger must have a cable of its own because the new iPhones ship with a Lightning cable that ends in a USB-C port, enabling the highest charging speeds, but you can't plug that in one of those older chargers. Slower chargers sound just what the doctor ordered if you care about battery longevity or if you usually charge your phone overnight. But perhaps you have one already from an older iPhone, and you are wondering whether it would be any good for charging your shiny new iPhone. Apple sells its own 5W charger for $19/€25/£19 apiece, and that's simply outrageous. We observed the slowest charging times with a 5W adapter. For our test setup, we've used the same phone - an iPhone 12 Pro, completely discharged and properly cooled before plugging it in.
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