Anker B08BYL3G9J Anker PowerCore Solar 20000, 18W USB (Open Box)

While this unit only has one USB port and a single USB-C charging connection, it's proven it's worth dozens of times over during the few months that I have owned it. I would have also liked a micro-USB connection and a second USB port, but I wonder how those would have impacted this battery pack's performance. (Sorry, I'm not an electrical engineer - would multiple ports generate too much heat? Incidentally, this item does feature a simple overheat indicator if your solar charging is too aggressive.) Whether you're plugged into an AC outlet to recharge or relying on the capable solar panel, it takes a while to get a full charge, but once achieved, that's where this Anker product really shines (literally & figuratively). The end has three LEDs which together feature high, low, or 3-flash signal settings, lighting up a campsite, roadside tire change, or indoor living space with a wide-area radiant glow. I can easily charge two Anker flashlights, an iPad/Kindle, a Bluetooth headset and a smartphone, with plenty of power left in reserve for more phone recharging and the ever-present solar panel always willing to contribute more. A couple of anchor points on the outer casing would be a welcome addition to allow for attachment to a pack or dashboard with more than a built-in lanyard. In the end, this is a solid investment in mobile power. It could benefit from a couple small improvements, but really the only drawback I foresee is weight - don't pack this for your ultralight backpacking adventure! If you're on the fence about this one, take a chance - Anker has made a great one and you'll find it worth the price! FWIW, save it to your shopping cart and wait for a sale price update, perhaps during Cyber Monday or Amazon Days. Got a great deal this way!