This battery charger with PSU will charge up to 5 receiver modules (IRR-NL23 or IRR-ST95). 

The complete receivers can be placed into the battery charger receiver ports without removing their battery cells. 

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.