Load times
The charging times depend on the battery type and of their property (mAh). Therefore, the load times vary according to packaging between 2-8 hours. One AA battery 2100 needs for example, about 5.5 hours to fully charge.
Device Features
The device has among other things a recognition of wrong battery types, a delta V cut-off and protection against wrong direction inserted batteries.
However, the device has a typical drawback of fast chargers. Apart from the 9V battery, the battery can not be charged separately! That is, it can always only 2 or 4 batteries are charged at the same time! This should be taken into account!
The USB port can also be used for charging when no battery is charging. So you can for example be a controller load overnight.