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External batteries normally give only 60%-70% of their capacity to other devices. Approximately 30% of the battery capacity is used up by the powerbank itself to actually generate the charge to the device it's trying to charge. These efficiency issues affect all electronics devices, and a fully recharged Anker PowerCore 25600 mah shall generally be able to give 7-9 charges to an iPhone 7 (1960mAh).
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