This battery is 1460mAh * 7.62v = 11.1Wh
The iPhone 12 battery is 2815mAh * 3.87v = 10.9Wh
If you take that 11.1Wh and convert it to 3.87vv, that's 11.1Wh / 3.87v = 2868mAh worth of iPhone charging, before charging losses.
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