While you should definitely have a 10,000mAH+ external charger for long trips and power outages, a small one with enough juice to give your phone a few extra hours of use can be just as valuable as a daily carry. This 3200mAh Fenix pack comes with a keychain ring, and is only $6 today. [Fenix 3200mAh External Charger, $6 with code NSNCPUA5]
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