Looking at USB Power Banks I noticed that a 20,000mAh power bank stated in the Items Specifics section as having a capacity of 8000 mAh. However, the Product Specification indicates a Capacity of 20000mAh.
Is this normal? Does a 20,000 mAh power bank only have a capacity of 8,000 mAh?
20,000 mAh @ 3.6v = 72,000 mWh
12,700 mAh @ 5.1v = 64,770 mWh
That’s about 90% when looking at the mWh. -> Very good
Assuming the same voltage thing for your power bank.
20,000 mAh @ 3.6v = 72,000 mWh
8,000 mAh @ 5.1v = 40,800 mWh
That’s about 57% -> Very bad
Perhaps a typo? Not uncommon on Chinese sites. 8000 -> 18000
20,000 mAh @ 3.6v = 72,000 mWh
18,000 mAh @ 5.1v = 91,800 mWh -> That would be magic, so no typo
$11 for 8000 mAh isn’t that bad but I would never buy it because I have to carry that weight around all the time.
But as flydive noted the picture doesn’t match the size. I think they just messed up big time.