ALLPOWERSDirect (99% positive feedback lifetime) via Amazon offers its 20800mAh battery pack with 4.5A output from two USB ports for $14.78 Prime shipped when you use code I3PRNJTO at checkout. Normally closer to $30, this is the lowest we’ve tracked and the best available. Perfect for keeping your iPad or iPhone charged on a long flight, this has enough juice to keep everything powered for hours. Rated 4.2/5 stars.

We have a number of other power accessories on sale right now, like RAVPower products from $9.

ALLPOWERS 20800mAh battery pack features:

  • Exclusive iPower and Fast Charging Technology: It can automatically adjust the current and voltage to achieve maximum power, delivering its fastest possible juice up to 3amps per port or 4.5amps overall
  • 4.5A Output Charging: Can charge two smart devices simultaneously at top speed, add 7+ charges to iphone6, 5+ charges to Galaxy S6, 2 charges to iPad air
  • Recharge 2X Faster: Large input 5V/2A, recharges in around 12 hours with a 2 amp charger, some other power bank (generally 1 amp) may take up to 17 hours
  • Safety Protection: It is FCC, RoHS, CE certified. Surge protection, short circuit protection and more advanced safety protections keep you and your devices safe
  • What You Get: 20800mAh external battery charger, Micro USB data cables(not for iPhone, but you can use the cable of your phone, AC charger NOT included), instruction manual, 18-month warranty and friendly customer service

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Patrick Campanale's favorite gear