I didn’t even know these ‘keychain’ sized Apple Watch charger existed until I saw an online ad recently. I found this one here. The reason I chose this one was due to the capacity (1.4mAh). Most of the other seemed to be 1.0mAh. In any event, this one works perfectly. A few things: It is slower than the Apple Watch plug-in charger that came with the Apple Watch, but that’s to be expected. How much slower? I timed it a few times and it appears to be about 4.8x slower. So in other words, to charge as much as the wall charger does in 10 minutes, you’d have to use this device for 48 minutes. Not great, but for me acceptable considering that it will be handy when a wall outlet is not available. Lastly, I’m not sure how long the battery in this device holds a charge. In other words whether it self-discharges quickly or tends to keep it’s charge at a fairly decent level during periods when it isn’t being actively used and charged. I haven’t had it long enough to experience this. But I do know that higher quality Li-ion batteries tend to have a slower self-discharge rate compared to cheaper ones.
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