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I use an Anker Astro Mini 3000 mAh as my daily carry-around-in-my-purse backup battery, and an Anker Astro E5 15000 mAh has my travel/power outage model. Both are available through Amazon, are decently priced, highly rated, have minimum 1 year warranties, and pretty good customer service.
I also have an older NewTrent brand that has performed pretty well over a few years, but never really lived up to the stated capacity or amount of charge it was supposedly capable of providing to an iPhone. The Anker brand seems to be a bit more efficient that way.
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