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I've a 10,000mah 3 amp one (branded powerwalker) but in my opinion their a bad solution, but they are handy to have in a power cut or similar.
If you have a phone that you can switch batteries best solution is buying an extended one and keeping your original as a spare, if you have to go for an external battery pack you want one that can put out at least 2 or 3 amps or they'll overheat and cut out when you try to charge a tablet or similar, generally the more amps the faster they charge as well but that depends more on your device.
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