This power bank is a cost-effective and convenient way to keep portable electronic devices loaded on the fly. According to Ocoopa, the hand warmer provides heat for up to 15 hours. Our tester came to a different conclusion, however. After multiple uses, our tester was able to consistently get three to four hours of use depending on the heat setting. Our tester also found it takes about an hour longer to charge than advertised. Approved by the Raynaud’s association, this portable hand warmer is suitable for use by people of all ages and comfortable to hold – it’s brilliant when you’re working outdoors, fishing, camping or watching live sport, or for those days when you just need a bit of warmth for your fingers. Nevertheless, we found this to be a great quality product, working consistently well each time and recharging efficiently. We also liked that the heaters use a standard USB charge cable. Anyone can use and benefit from rechargeable hand warmers, but those who are always cold may especially reap the benefits. You can keep one at your desk or couch to warm up indoors or bring them with you on your nightly jog. During winter activities, like sporting events or tailgating, rechargeable hand warmers can make a huge difference in your comfort.

Size can also factor in, but this is largely a personal preference and can vary based on the size of your hands. “There are a lot of different options and features in rechargeable hand warmers, so it is important to find the one that fits your specific needs,” says Dr. Zhang. We found the instructions could have been better; however, we worked out how to use the single button to switch the warmer on, change heat settings, turn on the flashlight, and reveal the remaining battery life without difficulty. The warmer also has a digital display and indicator light. It claims up to eight hours of battery life, and we were impressed with this aspect during our tests. We used it for three hours on the highest setting during the first and only used one of four battery bars. It also recharges in just three hours, eliminating long waits between sessions.It is ideal for hunters. It keeps your hands nice and warm, and besides that, you can recharge your cell phone with this hand warmer. It is a great buy for those who practice sports in outdoor areas. Lasts up to 6 hours of constant heat per charge and can be recharged in approximately 4 hours. Pros: Heat Source: Lighter fluid | Weight: 2.6 ounces | Heat Duration: Up to 12 hours | Temperature Range: Not listed Sarah Jeffries, paramedic and emergency care specialist and managing director of First Aid Course Leicester

SkyGenius Rechargeable Hand Warmer:This multi-purpose hand warmer retained its heat for some time, but the oscillating temperature became too hot for comfort and didn’t feel as durable as other options. The warmers have a long charge time: We started charging them in the afternoon, and it wasn’t until the next morning that they reached a full charge.Zippo Heatbank 9S Plus Hand Warmer: With a built-in flashlight and power bank, this hand warmer is multifunctional. Our tester found it “impressively hot” but wasn’t impressed by the unreliable battery. At times, our tester only got 30-90 minutes of use before it shut off. Your hands can get really wet in the cold weather, and at that time you would want to have a way to keep them warm. It has two extra functions: Phone charger and mini flashlight for emergency situations. With a variety of different weights, price points and heat sources, here’s our favourite hand warmers on the outdoor market at the moment.