These pocket-sized USB battery packs won’t win any price-per-mAh awards, but they each have a unique feature to justify their price premiums.
The $25 OLALA includes a built-in Lightning cable for iPhone owners, in addition to a USB port for your other devices, while the $14 Jackery Pop Slim is just about the thinnest battery pack you’ve ever seen, despite packing in enough juice to give any phone a full charge. Just be sure to note the promo codes below.
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