Bests & Worsts Reviews from Amazon

I wasn’t paid to write this review and neither was I given a free product in exchange for a review like others here. I spent my own hard earned money purchasing two hand warmers and here is an unbiased and honest review. There are 3 settings, low, medium and high. I actually tested and timed the devices to see how long they lasted. The low setting was warm and adequate for the bare hands. The first warmer (with a loose power button) lasted 18 hours before the device turned itself off. The second warmer (with a firmer power button) lasted 19 hours. After 15 to 16 hours, the temperature dropped and wasn’t nearly as hot as before, but it was still sufficiently warm. The medium setting was very hot and can be uncomfortable to hold for more than 5 to 10 seconds in my hands. You can wear ultra thin gloves or mittens to shield your hands if it’s too hot for you. Alternatively, you can simply hold onto it with your bare hands, let go when it gets too hot, and then repeat the procedure. This routine worked for me. The first warmer lasted approximately 15.5 hours while the second lasted about 16 hours before the battery died. The temperature did drop somewhat towards the end of the battery life, but it remained useable. The high setting was scalding hot. Unless you have thick skin like an armadillo, I strongly suggest wearing light thin gloves or mittens to protect yourself. The first warmer lasted 10 hours while the second lasted 11 hours. Surprisingly, it remained mostly toasty until the battery died. How long does it take to charge the battery? Using an iPad power adaptor and the included micro USB wire, the first hand warmer took 4.5 hours to fully charge. The second one took 5 hours to fully charge. So before you go to bed, charge it up for the next day. I’ve read other reviews here that said the battery died within 4 hours and that this product is cheap Chinese goods. I bought two hand warmers and tested them side by side and my testing proved otherwise. My guess is that some people may have received a device with a defective battery and should try for an exchange. The description says the internal battery is a Tesla battery and it might be true due to its longevity. The battery may be a 21700 cell. Perhaps someone here can open one up to find out. Here are some suggestions to the manufacturer for a second iteration of this model. First, they should fix the power button. On some devices, the button is loose and rattles when you shake the hand warmer. It can be annoying. This is where quality control is needed. Second, the rubber lining that forms the grip of the device should be firmer and not stretch as much. I suggest a stronger higher temperature rubber; perhaps something that can withstand the high temperatures under the hood of a car. As of now, I can see that someday, the lining will break through wear and tear. Third, like some reviewers have pointed out, they should make it waterproof or at least water resistant. That would make taking this hand warmer out in the elements more handy (pun not intended). This is why I took one star off. Final thoughts: This is a fantastic device. The run time outlasted what was advertised and kept me warm the entire day. This is ideal for outdoors, waiting for a parade, going skiing, watching a baseball or football game, etc… If you get a defective device with poor battery life, don’t be afraid to get it exchanged. I highly recommend these hand warmers. If you are on the fence, don’t wait. Just. Get. It.