Amazon.com: Customer reviews: Hand Warmers Rechargeable, Electric Hand Warmer, 7800mAh Long Lasting Heat up to 8 Hours, Double-Side Hot, Phone Charger, Soft and Comfy Surface, Quick Heating,Perfect Size for Your Hand/Pocket,Black
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Very good for the price point. Had it 5-6 months now. Charges my Pixel2 3 times EASY. Heater option is pretty good too. Switched pockets back and forth over the course of a cold day, 5 hours later still heating, nice.
I love these hand warmers! They are bit larger and heavier than the ones I have used before, but the 7800 milliamperes/hr battery lasts a long time. They also take a long time to charge compared to hand warmers with ~ 5000 milliamperes/hr batteries, but on balance it is clearly worth it. With my previous hand warmers, on a cold day I would get only partway through a hike and discover they had shut off due to low battery. That is not going to happen with these!