USB power banks are great for keeping your phone alive. But what happens when your smartwatch runs out of power? With the Portable Keychain Apple Watch Charger, you will always have a wireless charging point. This tiny adapter is now $16.99 (Orig. $30) at 9to5Toys Specials.

Measuring just 0.4 inches thick, this charger is easily small enough to live on your keychain or in your pocket. When you need to charge your Apple Watch, you simply plug the charger into a USB port and drape your smartwatch over the charger.

The charger can draw power from any USB output, including ports on your laptop. It takes around 2.5 hours to restore your Apple Watch to 100% battery, and less time for a partial charge. This means you can easily top up your watch at lunch or during a meeting.

The charger works with all four generations of the Apple Watch. It is made from durable plastic, and the USB tip is protected by a cap.

Normally priced at $29.99, the charger is now 43% off at $16.99. It comes in two versions: black and white.

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