The iPhone 15 Pro Max is equipped with a 4,441 mAh battery, supporting 20 W fast charging (according to Apple). However, in some previous generations, the actual charging speed was often faster than the manufacturer's announcement. Since the company no longer includes a charger in the box, users can proactively buy a product that supports higher charging capacity, for example 30 W, using the USB-C cable that comes with the device.
In a recent charging speed test conducted by Phone Arena , the iPhone 15 Pro Max started charging at 1% battery. After the first 17 minutes, the device received power quite evenly, reaching a capacity of around 26W, significantly faster than the maximum 20W as announced by Apple.
iPhone 15 Pro Max receives the highest charging capacity of up to 26W, more than the manufacturer's announcement
PhoneArena Screenshot
Thus, device owners can completely buy a higher capacity charger such as 25 W or 30 W (should use products from reputable brands on the market), not necessarily "sticking" with Apple's 20 W - a device with a high price while low capacity.
After 17 minutes of maintaining 26 W, the charging speed began to decrease, reaching 21 W and lasting for about 30 minutes continuously. The input current continued to decrease in the next period, averaging 15 W, maintaining 42 minutes and then gradually decreasing to 8 W for the next 5 minutes.
About 10 minutes of 8W charging, the iPhone begins to receive gradually lower power over about 10 minutes until the battery is completely full.
So, the iPhone 15 Pro Max can charge faster than advertised for the first 47 minutes and then gradually slow down over time. In other words, "fast charging" works best at around the first 50% of the battery, reduces the capacity until it reaches 80% and then switches to regular charging (or slow charging) after that point, especially at the last percentage of the capacity. This is also the general principle of current fast charging technologies to meet the urgent needs of users, but prolongs the charging time after the device reaches the first 50% to protect the battery as well as maintain thermal stability for the device.
Despite surpassing Apple's 20W maximum claim, the iPhone 15 Pro Max is still the slowest charging high-end smartphone on the market today. Many phones from other manufacturers have long accepted 30-45W charging, while some Chinese brands are supporting 65-67W charging or up to 120W even on mid-range models.
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