(Information excerpted from the NLSBPH.org Materials Development Division website.)

Connect player to AC power

Install the latest version of the software.

Clear any power-fault by:

 - Enter Service Level 1: Turn off the player, then while holding down RW, Sleep & Tone Up buttons press the Power button. 
 - Press and hold the Sleep buttion while the status messages are playing until the player powers off.
 - Enter Service Level 2: Turn off the player, then while holding down RW, Sleep & Tone Down buttons press the Power button.
 - Press RW to get to the "Battery" option and then Play/Stop to select.
 - Press FF to move to the "Initiate Battery Recharge" option and then Play/Stop to select.
 - Press the Power button to exit the service level and press the Power button again to turn the player on.
 - Wait five minutes. (Although the player will report "Battery recharge in progress" during this period in response to pressing the Power button, this is an indication of the player's intent rather than actual operation.)
 - Press the Power button once to hear the battery state. If the player reports "Battery recharge in progress" then recharging has commenced.
 - Wait for three hours (for a fully discharged battery) to confirm that the charge has successfully concluded. During this time, the "battery charge remaining" message, in response to pressing the Power button will give an indication of charge progress.

If the player's serial numbers is below DS1-0064602 or DA1-0024536, then the player may not be able to charge the battery if it is too severely depleated. Remove the battery from the player and place it in a later serial number player that is capable of recharging the battery pack. After about 1/2 hour of charging, remove the battery and return it to the original (low S/N) player. Confirm that the original player can now recharge the battery by forcing a recharge (in Service Level 2) (it is likely that the player will recharge the player without having to initiate a recharge after a few minutes)

(Added by IN1A)