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Sunvalleytek via Amazon offers the RAVPower Dynamo-On-the-Go 10,000mAh External Battery Pack, model no. RP-PB06, for $59.99. Coupon code "EYB5BBOJ" cuts it to $39.99. With free shipping, that's the lowest total price we could find for any 10,000mAh battery pack by $10. (We did see a generic 12,000mAh unit for $7 less earlier this week, since expired.) It features an LED status bar, dual outputs to charge two devices at once, and connectors compatible with iPhone and iPad, as well as HTC, Samsung, and other smartphones.