Keep your smartphone alive with these portable battery packs that are all on sale

Whether you’re planning on taking a vacation or your daily commute leaves you racing into the house with less than 6% left in your smartphone battery, you could probably use a portable battery pack. Or perhaps you know someone who does. 

These five backup power banks are perfectly suited for whatever your mobile charging needs may be — and they're all on sale.

Extreme Boost 20,000mAh Backup Battery — save $54

If you tend to carry several devices, you should check out the Extreme Boost 20,000mAh Backup Battery. This portable battery pack can charge up to four devices at once with a huge 20,000mAh reserve of energy, so you’ll never have to worry about your earbuds running out of juice while you’re stuck in an Uber Pool. Plus, the Extreme Boost offers surge, overcharge, and overcurrent protection, preventing your devices from getting overloaded or wearing down with too many charges. Normally this backup battery retails for $89.99, but they're on sale for just $35.99. Read more...