External batteries just keep getting more interesting. The ZeroLemon Solarjuice 20,000mAh Battery comes as loaded with features as anything we’ve seen recently. More so, actually. Not only does it provide you with 20,000mAh in charging capacity through two USB ports, at 2.1A and 1A of output (that’s a lot, by the way), it also recharges itself through a 1.2W monocrystalline solar panel. So think about the usage scenario. You go out in the woods, camping, and you get to charge your electronics away from the grid. Then you leave your battery pack charging itself in the sun for the day, only to come back in the evening and be able to do it all over again. It’s brilliant, and more importantly, it’s also cheap. The ZeroLemon SolarJuice is $49.99 instead of the regular $100!