How long will a charging battery case & portable iphone charger last?

About 2 and a half times. The average iphone battery is less than 1500 mAh, so yeah. I don't know how long you phone lasts on a full charge, but take that time and multiply it by 3, that should give you an average of how long your phone on 100 percent charge will last with a 2600mAh portable charger.

Most phone has 2ah cell or 2.5ah cell. Then this portable charger is only good to recharge back the phone in full for one more time and then the portable charger ( inside has a battery ) is no more power.

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