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Nitecore's NPB4 is the Hummer H1 of power banks

The 20,000mAh power bank is both waterproof and impact-resistant.
Nitecore NPB4

Designed for the outdoors, the Nitecore NPB4 is a tank of a battery pack. The power bank can be submerged up to 2M/6.5ft and it's housed in a fire retardant shell that is both impact-resistant and can withstand high temperatures. When it comes to power, the NPB4 uses long-lasting, high-performance 21700 lithium-ion batteries that deliver 20,000mAh, which is enough to power an iPhone 12 six times. You also have 18W of output via USB-C or USB-A, a touch sensor power level indicator, and an array of safeguards for additional protection against short-circuiting, overcharging, and heat. 


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