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TL;DR: Get an Apple Watch charger that you can take anywhere. The Apple Watch Wireless Charger Keychain is compatible with any Apple Watch and is 61% off.

Whether you’re at the end of a long day or forgot to throw your Apple Watch on the charger last night, sometimes batteries get low. Instead of carrying around your bulky Apple Watch charger all the time, get one you can set and forget. The Apple Watch Wireless Charger Keychain has a built-in battery and works with any Apple Watch, and it’s on sale for only $18.99 (reg. $49).

Apple Watch batteries can last a while, so it’s easy to forget to throw it on the charger once in a while. If you leave the house with a low battery, don’t stress. Just stick your watch to your keychain and charge it back up.

This compact, durable Apple Watch keychain has a 950mAHh battery you can use to charge any series of Apple Watch. If you’re in a pinch and need your smartwatch, this backup battery could come in handy, and you can take it practically anywhere.

One verified buyer writes, “I left for work in the morning and realized I forgot to charge my watch at night. By the time I made it to work, this charger had my watch at 50%! What a lifesaver!”

As useful as a portable battery is, sometimes you might need a little more power for a full recharge. That’s alright. Just connect a Micro-USB cable to your charger. This portable Apple-compatible accessory can recharge its own battery while it powers up your Apple Watch. To check your charging status, just look at the four LEDs. You might be surprised how quickly it refills your battery.

Shop smart, and you may not have to deal with a low battery on your Apple Watch anymore.

Get the Apple Watch Wireless Charger Keychain on sale for $18.99 (Reg. $49).

Prices subject to change.