The battery is a battery official in any case from the reviews to prove it.
It charges about 3 to 4 times my Android phone completely as expected
It is heavy but quite transportable. She slowly recharges with a standard charger.
I for one load with the Nexus charger that delivers 1.8A. So it recharges in 4 to 5 hours when fully discharged.
Good battery, no excessive overheating or during charging or during discharge.