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The manufacturer Terratec sent me a power bank for the Apple Watch a few days ago, which can be hung on a keychain with a small carabiner. The device belongs to the Air series of Terratec chargers and is called Terratec Charge Air Key. It offers the possibility of supplying the Apple Watch with power with a built-in battery and integrated charging cradle - even if there is no power outlet nearby.
Terratec made the mobile charger available to me free of charge for the test, but of course I took it under the microscope without reservation in order to offer you an objective test.
Before we get to the actual test report, I would like to briefly name the technical data and the accessories that are supplied with the Terratec Charge Air Key. The scope of delivery is dealt with quickly, because in addition to the charging battery itself, you will only find a micro-USB charging cable, operating instructions and a service card in the pack.
The technical data are also clear:
Visually, the small power bank somehow reminds me of a car key, because the form factor is quite similar to my VW key. This parallel is perhaps not by chance, because after all, the Terratec Charge Air Key Powerbank should also find space on the keychain and should therefore not be too angular.
The workmanship looks solid and I don't think that the Apple Watch power bank will be damaged if it is carried around in your pocket. Only the surface of the additional battery is likely to be scratched by the keys sooner or later, but this will not have any effect on the wireless charging function.
I use the Apple charging cable on my bedside table to charge the watch here and there in the evening when I'm reading something in bed. At night, however, I have the watch on my arm, because I find the silent alarm function much more pleasant than a loud jingling of my iPhone.
Unfortunately, the battery of my Apple Watch does not fully charge in the evening during my reading time, as I usually only enjoy about 20 minutes of bedtime reading before I sleep and so the Apple Watch battery is below 20 during the day at the latest on the third or fourth day Percent down.
The necessary charging cable is then in the bedroom and I'm at my desk or in the car and can't charge the watch.
The power bank from Terratec steps in here and can supply the watch with the necessary power so that it does not have to go into the "power reserve". That's pretty handy, but there is one caveat to it: the loading speed.
With the charging cable from Apple, I get almost exactly 1 percent charge per minute. This means that from an almost empty to a completely full Apple Watch, it takes a little longer than 1,5 hours.
If I use the Terratec power bank, I can charge around 0,5 percent per minute, which is half the speed. Filling an Apple Watch with it should take significantly more than 3 hours.
I definitely don't use the Terratec Powerbank for the Apple Watch to completely fill an Apple Watch. With a capacity of 950 mAh, it would probably do this two to three times (see Capacity of Apple Watch models), but the loading time is not suitable for everyday use for me.
For this reason, I tend to use the Terratec Charge Air Key to charge the Apple Watch while I'm driving or at work, so that I can get through the day. Even for short trips of 2 to 3 days you can master the Terratec Charge Air Key Powerbank without packing an extra charger for the watch. I still carry out a full charge with the Apple charging adapter.
For the price of 25 euros, the Terratec power bank is one of the cheapest for the Apple Watch. Therefore, you can get the power bank for the Apple Watch from time to time. If you like, you can get the Terratec Charge Air Key look here at amazonn or go through this product box:
If you don't actually need a keychain-compatible solution, but are still looking for a mobile charging option for your Apple Watch, you can also get the Terratec Charge Air charging adapter pick up.
This does not have an integrated battery, but you can operate it as a charging adapter on any power bank and thus fill the Apple Watch even without a socket. However, I cannot say anything about the loading speed because I was unable to test the product. Maybe Terratec will buy me another copy for a test. ;-)
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Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.
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