This battery charger with PSU will charge up to 21 battery cells (BAT-01) in its 21 ports.  The cells must be removed from the units to which they supply power and placed directly into the battery charger.

The cells are environmentally-friendly Nickel Metal-hydride batteries, which in normal use will provide about 6 hours of continuous use per charge and have a life-expectancy of up to 3 years.

Normally an exhausted battery would be fully re-charged after an overnight charge in the battery charger.