Sony MDR DS4000 - Manual (Page 9)

Preparation
9 GB
Charging the Supplied Rechargeable
Nickel-metal Hydride batteries
The supplied rechargeable nickel-metal hydride batteries are not charged from the
first time you use them. Be sure to charge them before use.
To charge the headphones, place them on the processor.
Inserting the supplied rechargeable nickel-
metal hydride batteries
1
Press the button of the left housing to open the battery compartment lid.
The battery compartment lid comes off.
2
Insert the supplied rechargeable nickel-metal hydride batteries into the
battery compartment matching the 3 terminal on the batteries to the 3
marks in the compartment.
Do not attempt to charge any other kind of battery with this unit.
3
Close the battery compartment lid.
Button