We post a lot of deals on hulking 10,000-20,000mAh external USB battery packs here, and they're great for long trips and power outages, but obviously not ideal for carrying around in your pocket on an average day. For that, a lipstick-sized charger that can give your phone an extra few hours of battery life is all you need, and we've got one for $8 today. [RAVPower Luster 3000mAh Mini Portable Charger, $8 with code BA5O7IZP]

This would also pair well with a keychain-compatible charging cable.

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