The iPhone 13 Pro Max has been confirmed to support fast charging at up to 27W, a figure that Apple has never officially disclosed but was uncovered through independent benchmark testing by the ChargerLAB YouTube channel.
iPhone 13 Pro Max Fast Charging: What the Tests Reveal
Apple has long kept certain hardware specifications private — RAM, battery capacity, and charging speeds have historically been absent from official product pages. Fast charging details for the iPhone 13 Pro Max are no exception. Despite this, third-party testing has filled the gap: the iPhone 13 Pro Max supports fast charging up to 27W, while the iPhone 13 Pro sits slightly lower at 20W. This makes the 13 Pro Max the highest-wattage charger-compatible model in the entire iPhone 13 lineup.
For context, the broader smartphone market has grown intensely competitive on charging speeds. Brands such as Xiaomi have pushed their flagship phones to 65W charging and beyond, leaving Apple's numbers looking conservative by comparison. Even so, 27W represents a meaningful step forward within Apple's own ecosystem, and the real-world result is tangible: the iPhone 13 Pro Max can reach a full charge in approximately 90 minutes.
Battery Capacity and Charging Hardware
Alongside the charging speed discovery, separate benchmark testing revealed that the iPhone 13 Pro Max houses a 4352mAh battery — again, a figure Apple does not publish. This is one of the largest batteries Apple has put inside an iPhone, which explains why the device achieves some of the longest battery life ratings in its class despite not matching Android rivals on raw wattage.
One important caveat for buyers: following a policy introduced with the iPhone 12 series, Apple does not include a power adapter in the box. To take advantage of the 27W fast-charging capability, users need to purchase a compatible USB-C power adapter separately. Apple's own 30W or higher USB-C adapters will work, as will third-party chargers that meet the required USB Power Delivery specification.
How Does the iPhone 13 Pro Max Charging Compare to the Rest of the Series?
- iPhone 13 Pro Max — up to 27W fast charging, 4352mAh battery, ~90-minute full charge
- iPhone 13 Pro — up to 20W fast charging
- Both models omit a charger in the box, continuing the iPhone 12 precedent
The charging speed difference between the Pro and Pro Max makes practical sense given the larger battery in the Max model — more watts are needed to maintain a reasonable charge time when the capacity is higher.
Why Apple Keeps Charging Specs Unofficial
Apple's reluctance to publish charging wattage figures is a longstanding pattern. The company prefers to promote experience-level claims — such as how long the battery lasts on a charge — rather than technical specifications that invite direct comparison with Android competitors. Revelations like those from ChargerLAB are therefore valuable to consumers who want to make informed decisions about which charger to buy or whether the iPhone 13 Pro Max meets their fast-charging expectations.
If you are already invested in the Apple ecosystem, you can read more about related devices on our Apple category page.
Key Takeaway
The iPhone 13 Pro Max is the fastest-charging phone in the iPhone 13 series at 27W, with a 4352mAh battery that can go from zero to full in around 90 minutes — provided you supply your own compatible USB-C charger.
