The RAVPower 25000mAh USB-C solar portable charger (opens in new tab) falls to just $36.99 when you combine the 10% on-page coupon with code RAVPOW016 at Amazon. This device is $50 without the code and this is the lowest we've seen it go before. Note that promo code only applies to the yellow version.
This device works like a regular portable charger for the most part. It has a 25000mAh battery that you can recharge via regular methods. It uses micro USB and USB-C so that you can plug in both ports and charge it twice as fast. And it can power up to three smartphones or tablets at once with its two USB-A ports and one USB-C port. The solar charging capability is an added bonus. While it would take a while on its own (up to 85 hours) in direct sunlight to fully recharge, you can use it to supplement your portable battery while you're on the go and during emergencies. I personally have a battery pack like this that is clipped to my backpack while I'm out and about which means I have to re-charge it ever-so-slightly less often. Maybe add a carabiner (opens in new tab) to your order so you can do the same on your next hike.
The whole thing is built for the outdoors. It's dust, shock, and water resistant. There's also an LED emergency light with SOS modes. Users give it 4.1 stars based on over 200 reviews (opens in new tab).
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