I have 2 power packs. One of them is 10,000 mAh from Jonkuu. The vest just doesn't run away from him. I don't know if it's a vest or a power pack. It works to charge phones. The other power bank is a 25,000 mAh universal power bank. This vest works great. This weekend it ran at high power for 6 hours and still had 1 out of 4 battery lights on. The 25,000 pack is twice the size and weight of the more common 10,000 pack, but lasts much longer. Place it close to the skin for better warming and wear most of the insulated clothing over it.
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