For many of us, an external battery pack comes in near the top of our accessory priority list. Whether you travel for work or pleasure, topping up your gadgets on the go can be important, and that need can extend into durations or locations that require a few extra features or added durability. So, for all you outdoorsy types prepping for summer trips, we're taking a quick look at two new RAVpower batteries. One is "waterproof," both are solar-powered, and they clock in at 10,000mAh and 25,000mAh respectively. 

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