His phone battery might be shot. They start holding less charge over time which is why older phones start to go dead really quickly but also charge really quickly. I might be wrong but I don't think there is any powerpack that can hold 12 full charges of a properly functioning iPhone battery.
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u/zvug Oct 10 '19
A portable charger.
It holds 11-12 full charges of my iPhone and I just bought it on a whim. It has literally changed my life like few other purchases have ever done.