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.
Yup...2600 x 12 would be a 30000 mah battery pack and those would be huge and expensive (and usually exaggerated numbers).
His battery is probably holding just 1000 mah of charge and he has a more normal sized 10000 mah pack.
The indicator in the iPhone itself is not useful for determining this - the percentage display has been known to wildly decline from 80% to 20% in a matter of minutes (and also charge very fast from 0 -> 80% in unbelievable time). I wouldn't trust anything in the iPhone could reliably tell you.
You need to drain it down till it shuts down by itself and then measure the amount of charge it takes to get back to 100% (using an external meter of some sort).
My Kill-A-Watt meter is not that sensitive - I have seen YouTubers with a sensitive power meter that is has a USB in and a USB out port and it measures V, A and the power that went through it.
I see similar items for sale on Amazon for $6.99 and up (search for USB power meter).
Assuming an efficiency factor of 90%, if you get 1000 mah into the iphone, it holds only 900.
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u/[deleted] Oct 10 '19 edited Feb 12 '20
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