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Cold paws in winter are not nice. And even if I'm not a big fan of Christmas markets, there are often enough walks or work around the house that make my fingers cold. To remedy this condition, I looked around last year for a couple of USB hand warmers, which I found in the Report on battery pocket warmer with USB connection Had presented.
I tested a few models in the last year and ended up with the "BigBlue hand warmer"because it offers some practical advantages that other USB pocket warmers cannot offer:
Some of the pocket warmers that I have been using have only reached "lukewarm" at most and then did not have enough battery to give off heat for over an hour. Others did not have a USB output to charge the iPhone and still others had such an inconvenient power switch that it was constantly activated in the jacket pocket or in the backpack.
With a capacity of 6000 mAh, the BigBlue has enough power to charge the iPhone and keep your hands warm for a few hours. In the low level (in which it delivers up to around 40 ° C) it lasts a good 4 hours - an information from the manufacturer that I can confirm.
The "high" level is significantly warmer and still provides warmth of approx. 2 ° C for 50 hours. You can still hold it in your hand without pain, but it is sometimes too warm for me. When I use it at this level, I switch it back to "low" every now and then.
Last year I used a hand warmer from CSL (oval design), among other things. However, this had the disadvantage that it only got warm on one side (probably because the electronics or the battery were installed on the other side). This is not the case with the BigBlue. This becomes evenly warm on both flat sides and invites you to warm up the whole palm or even both palms at the same time.
That the electric USB hand warmer also serves as a power bank is very important to me personally. On the other hand, the speed at which the iPhone is charged is rather unimportant to me. I once measured the power with which the BigBlue charges my iPhone X and came to about 5,6 watts. That's not quite as much as my favorite power bank (Zendure A2) manages, but loose enough to charge while using GPS, such as on a hike. From my point of view, there is nothing to complain about in this regard.
What you should consider: A hand warmer in the jacket pocket is of course not only good for the fingers, but also for the iPhone or smartphone, because they also have to deal with low temperatures and are happy when they are in the pocket with the hand warmer be kept at a comfortable temperature.
In sub-zero temperatures, the last iPhone models (iPhone 6 and 7) often saw the iPhone switch off while taking photos or using GPS because the battery could no longer supply enough power. This problem can also be recognized in advance by the fact that the battery level drops massively within a few seconds. If the iPhone is "at the right temperature", the chance of such failures and problems drops significantly.
What I personally think is very nice about the BigBlue pocket warmer (and what I haven't seen with any other model): It is flat like a smartphone (about 1 cm thick) and has a size between an iPhone XS and the XS MAX lies. All corners and edges are strongly rounded. This design ensures that it can be comfortably carried in your pocket. On the other hand, it can be folded flat with the iPhone in the jacket pocket, as these can be "stacked" wonderfully. Especially if you use it in between to charge the iPhone, it means less clutter and waste of space in your pocket.
Actually, every smartphone already has a built-in flashlight function. Nevertheless, I find it very helpful that the BigBlue pocket warmer comes with three LED lights that can be activated by pressing the button on the corner of the device for a longer period of time.
Pressing the button works significantly faster and more reliably, especially when wearing gloves, than if you first activate the screen on the iPhone and then click on the appropriate lamp symbol.
Now that I've been using this hand warmer power bank for the second winter, I can give you two tips that seem logical to me in retrospect:
Anyone who is often outside and struggles with cold hands should get a copy for every jacket pocket or hand. So you can warm up both hands at the same time and don't always have to move the electric hand warmer from one pocket to the other. And by the way, you are the most popular man or woman on site at every winter outdoor event, if you can even lend one of the USB pocket warmers. So in retrospect you should perhaps order three of them straight away. ;-)
A normal charging cable is not ideal for charging the iPhone, as it protrudes far from both the power bank and the iPhone and thus exerts strong leverage on the Lightning or USB sockets. But it is also not very healthy for the cable, as it is repeatedly kinked at the plugs. Sooner or later this leads to a cable break.
Much more practical are here angled Lightning charging cablethat stick out less. At first glance, you might think that short cables are a good idea here to prevent the mess of cables in your jacket pocket. In practice, however, it's not that great because you always have to dig out the iPhone AND the pocket warmer when you want to get on the smartphone. This is much more relaxed with a long cable, as the pocket warmer can stay in the pocket.
Since this year there is also one larger BigBlue model with 10.000 mAh. This should provide enough warmth even for larger companies. I still have the 6000 mAh version, which was always sufficient for me. The larger 10000 mAh pocket warmers are also quite heavy and take up more space in the jacket pocket. For this reason, I would probably prefer to stick with my solution with two "small" hand warmers.
I wish these USB hand warmers had existed before. In my time, these heat pads came on the market that have these metal plates that you have to bend. Everyone was happy, but somehow they didn't give off warmth for very long and therefore quickly disappeared into the drawer.
The electric pocket warmers that can be recharged via USB, on the other hand, are a real delight. You are with me on every winter hike and the fear of cold fingers and an empty iPhone is dispelled for the time being.
I can do that BigBlue hand warmer "Warmly" recommend. The solid construction and the fact that it has survived several missions with me show me that I can't be so wrong.
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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