An external battery pack can provide some peace of mind, but what happens if the power's out long enough to drain it down? Or what if everyone requires more juice on the next camping trip than you plan for? What charges the chargers?

It's when thinking of those moments that a solar-powered external battery back sounds really compelling. So here's the deal. StackSocial is currently offering a ZeroLemon SolarJuice 20,000mAh external battery pack for $49.99, 50% of its usual price.

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The unit comes with two USB ports (2.1 & 1A), so you can power multiple devices at once. You can recharge the pack itself through its microUSB port or the 1.2W monocrystalline solar panel that lines the top. It also comes with an LED flashlight, because why not?

Shipping is free, but the product is only going out to folks in the continental US. There's also a 1-2 week wait time before units hit the mail. The sale will end in six days.

ZeroLemon SolarJuice 20,000mAh external battery pack on StackSocial