[hackcasual]

I suspect the 100% charging time was miscalculated. USB power is 5volts, so a 1A charger meants 5W of continuous power. Battery charging, especially past 85% is not very efficient, so I suspect total charging time will be more in the neighborhood of 20 hours.

[pascal_cuoq]

You are right.

Without even taking into account efficiency, “nine hours for 100 percent charge [of a 50 Whr battery] on a [5V USB] 1A power supply” obviously breaks the conservation of energy. The claim “4.5 hours for 80% charge” breaks it even more.

They should make perpetual motion devices, not external batteries.

[jmgrosen]

My guess is those times are assuming a 2A charger, which isn't particularly uncommon nowadays.

[hackcasual]

They call that out as taking half as long. My guess is they calculated the charge time using 1A but the voltage from the output (17v?)

[rasz_pl]

>nine hours for 100 percent charge on a 1A power supply

They are simply LYING, probably learned from the same Chinese that will build it for them using 5000mAh* Ultrafire 16850 cells ;)

*400mAh when tested