+ Current for charging is not won over USB, but is diverted directly from the power supply.
(USB is not unnecessarily burdened, and works even when switched Wii)
+ Automatic shut-off when the battery is fully charged.
(Overload protection, a green LED will flash during charging and lights up when the battery is fully charged)
+ Beautiful design
-With Cases not rechargeable.
Batteries last longer, but are more expensive. (+ Money saving)