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  • If a phone has a battery capacity of ~2k mAh, and a power bank has a capacity of ~10k mAh, am I right in thinking that the power bank can deliver approximately 5 full charges to the phone? Or doesn’t it work like that?

  • Essentially, yes. It won't quite do five full charges as there will be some losses in the charging circuit, but as a rule of thumb it'll be close enough.

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