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A great portable charger is on sale on Amazon today only.
It’s the Anker PowerCore 10400 Portable Charger. Depending on what phone you have, you should be able to get at least 2.5 full charges off of one charge from this portable charger. It’s a serious travel must have for those long flights or hikes! I currently have one with less capacity, but I’ve had my eye on this charger for a while now and I’ll be picking one up today while it’s on sale. Reader Jimmy points out that you can use promo code J2JVQ4JA for an additional $3 off.