I have accidentally found an incredible solution to my cold fingers that result from Raynaud’s Disease. The OCOOPA Fast-Charging 10,000mAh back-up battery and handwarmer with PD & QC 3.0 has three temperature settings and heats both sides of its excellent Ergonomic Design: The upper-wide, lower-narrow design is more suitable for grasping than the oval shape, fits the natural curve of your palm and is anti-slip. High-grade silicone oil surface coating, soft and delicate to the touch, also has superior thermal conductivity.
The hottest setting is almost too hot to handle and the units I tested lasted for nearly four hours on high, and more than 12 hours on the lowest setting.
Recharging is super fast; I used an 18W USB wall charger, and it only took three hours and 12 minutes to charge a completely drained unit.
These are an excellent power source and back-up battery for your mirrorless camera and mobile phone as well.
I have now have four of these with me at all times while in the field: one for each loose fitting mitten, and two extra fully charged units as backups in case I accidentally forgot to turn off or charge them. On the coldest of days, I can use the two extras as heaters in the inside pockets of my parka.
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