Apple has updated its hardware charging setup for the latest Apple Watch models. The Series 12 and Ultra 4 now support much faster charging—but only when paired with a newly designed charger puck.
Faster Charging: What’s Changed?
The new Apple Watch Magnetic Fast Charger (model A3277) can deliver up to 10 watts of power, doubling the output of the older 5-watt charger. But higher wattage alone isn’t enough—you’ll also need a USB-C power delivery adapter that outputs 10 watts or more to unlock the speed boost. This new puck is already shipping with every Series 12 and Ultra 4 out of the box. If you need extras—for a desk setup or travel—Apple has put the puck on sale separately in its online store for $29 in the U.S.
Battery Gains: How Much Faster?
With just a 15-minute charge using the new charger, Apple says the Series 12 will gain enough power for around 12 hours of use, while the Ultra 4 will net about 18 hours. By comparison, the outgoing Series 11 and Ultra 3 receive only about 8 and 12 hours respectively from 15 minutes of charging. But this improved charging speed only applies when the new charger is used with the updated models—the older watches will not benefit from the extra wattage.
To recap:
- Series 12: 15 minutes with new charger ≈ 12 hours of battery; old charger delivered ≈ 8 hours.
- Ultra 4: same time span gives ≈ 18 hours instead of ≈ 12 with the previous puck.
- Series 11 & Ultra 3: no change, even with the new puck—they already maxed out at their current speed since their hardware isn’t upgraded.
The new charger is a 1-meter, USB-C cable-equipped puck, matching Apple’s broader trend toward USB-C across its devices.
This launch follows the introduction of the Series 12 and Ultra 4 watches, which rolled out with new hardware designed to accommodate this faster charging technology.
What this means: The faster charging capability underlines Apple’s incremental but meaningful enhancements. If you’ve upgraded to Series 12 or Ultra 4, expect significantly reduced downtime. For older users, this highlights a growing divide—newer models offer higher performance hardware that can’t be unlocked by accessories alone.
