Getting caught with a dead battery while you’re on the go can throw off your entire day. And unless you want to stop everything to track down an outlet, it’s worth snagging a portable charger — especially when you can find one on sale. Right now, Amazon is offering 50% off this 20,000-mAh iWalk portable charger when you use the promo code IWALK222, so you can pick it up for just $20. There’s no set expiration for this deal,
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