Watch out for rechargeable USB lithium battery packs being offered on ebay. Some of the claims for capacity are getting ridiculous, like 2 million mAh!!! The same for at least one such pack listed on Amazon which claims 50,000 mAh and an outrageous price. Remember that anything over about 26000 mAh in one lithium ion or lithium polymer battery pack or battery powered device cannot be carried on a plane in the USA or on most foreign air carriers.
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