The iPad has sported 10 hours of battery life since its inception in 2010, but the capacity of those batteries has changed dramatically over the years: The new batteries in the 10.5-inch and 12.9-inch iPad Pro are 30.4 and 41 watt-hours respectively — that's a 5-16 watt-hour difference from the original iPad's 25 watt battery. As such, you need a lot more juice if you want to fully charge Apple's latest iPad line.

But Apple's charging methods have also improved. The company still includes an annoyingly-slow 12W USB Charger in the box — which takes a whopping 4-5 hours to charge a 12.9-inch iPad Pro — but if you're willing to pony up a few extra bucks, you can take advantage of the iPad Pro's support for quick-charging to charge your iPad in half that time.

And even if you don't have an iPad that can take advantage of quick charging technology, we also have some great tips for reducing your charge time below.

### The science behind charging your devices

How exactly does charging work on your iPad? Let's break it down.

• Watt (W): Total power and capacity of either a battery or an adapter.
• Amps (A): The current at which power can flow between a charger and a battery.
• Voltage (V): The amount of power being pushed from an adapter.

When you charge an iPad, iPhone, or computer, you're resupplying its battery (measured in watt-hours) from a power source like a wall outlet, usually via an adapter. That adapter controls how much power you can get (volts) from that outlet, and the speed at which you get it (amps). Those two factors multiplied result in the adapter's total available power.

So how can you tell which adapter is best for your device? It's not about total watts — it's all about the amps and voltage. Modern iPhones and iPads support charging up to a current of 2.4A at 5V, while older devices charge around 1A at 5V. To get the best adapter for your device, you want one that charges at the appropriate amps (1-2.4A) while supplying the right amount of voltage.

Can I short-circuit my device with the wrong adapter? In short, no: Modern devices are built to only accept specific amp levels, so even if you plug your iPad into an unsupported adapter, you'll only get the bare minimum the adapter supports (either the 5V/1A or 12V/2.4A charging spec).

A 5W iPhone adapter will pull just 1 amp at 5V, for instance, while USB ports on a computer can deliver 0.5-2 amps, and the 12W iPad adapter can deliver up to 2.4 amps.

The 30W USB-C Adapter is special because it supports 5V charging at 2.4A (~12W), but it also supports USB Power Delivery for compatible devices, which allows them to charge at a much higher voltage and lower amps. Because the amps are lower while the voltage is higher, it's more efficient from an electrical standpoint and offers more power to devices that can take advantage of the technology.

## What iPads support fast charging over USB Power Delivery?

Currently, you can quick charge the following iPads:

• iPad Pro 12.9 (first generation)
• iPad Pro 12.9 (second generation)

For some great graphs on just how quickly Apple's USB-C adapter can charge the iPad Pro, check out MacStories.

All other iPads aren't configured to get any benefit from charging with the 30W adapter and USB-C, though you can use our quick charging tips below to slightly improve your charging speeds.

To take advantage of USB-C's Power Delivery standard, you need two things: a cable, and an adapter.

#### USB-C to Lightning cable

You can't use the USB-C power adapter without a USB-C to Lightning cable (or a USB-C to USB-A adapter). When Apple originally released this cable in 2016, it was designed for folks to connect Apple peripherals to the USB-C exclusive MacBooks — but iPad users can take advantage of it, too.

You can grab this cable from Apple for \$25 for the 1m or \$49 for the 2m. There are third-party options available, but remember that only Apple-made products are guaranteed to fast charge your 10.5- or 12.9-inch iPad Pro — until we have confirmation that third-party cables work reliably, we're wary to recommend other options. (No one wants to accidentally fry their iPad trying to get a fast charge, after all.)

#### Apple 30W USB-C power adapter

This adapter is the key component to fast charging your iPad Pro. Unlike the larger MacBook and MacBook Pro USB-C power adapters, this one has the combination of voltage and amps needed to efficiently fast charge your iPad Pro. Unfortunately, Apple doesn't offer an iPad Pro option with this adapter included in the box, so you'll have to grab it from Apple for \$49.

Note: Apple's 87W and 61W adapters also support the 14.5V/2A output necessary for fast-charging iPad Pro, but they're more expensive to buy on their own.

#### Make sure it's asleep

This might seem obvious or completely out of the blue depending on your habits, but putting your iPad to sleep is a great idea if you want to fast charge. When you let your iPad rest, it keeps the battery from being simultaneously drained by the display and backlight while it's also trying to accept a wall charge.

#### Turn on Airplane Mode

By enabling Airplane Mode, you're able to put the Wi-Fi radio (and cellular radio if you have a Cellular + Wi-Fi iPad) to sleep, which immediately takes a load off the battery.

#### Just power it off

We need rest to recharge; so, too, does the iPad. If you can spare using your tablet for a little while, shut it down and let it focus entirely on charging.