I use a mophie battery pack/case for my phone. I've been using them for the past several years and they have worked like a charm (got the first one, when I got my original iPhone). Right now, I'm using a Kudo case/battery pack/solar charger for my iPad. I've had it a bit over a year and haven't had any problems. As an external battery, I use the mophie powerstation pro. Works like a champ and holds a charge for a very long time. Some external battery packs seem to lose charge while they sit around waiting to be used.
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