Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 71 (click to view)
07 Additional Information Using the player with a battery pack
This player can be used with either the PDV-BT20 battery pack (supplied with PDVLC20), or the PDV-BT25 high-capacity battery pack (optional). Please read the operating instructions that come with your battery pack.
Recharging the battery pack
You can recharge the battery cpack whether it is attached to the player or not. The PDV-BT20 takes about 2.5 hours to fully charge from empty; the PDV-BT25 takes about 5 hours. 1 Plug the power connector into the DC IN jack on the rear of the battery pack. Plug the other end of the power cord into a wall power outlet.
Attaching the battery pack
1 Line up the back of the player with the back of the battery pack.
1
2
1 2
2
Catches
2
Gently push the player down on to the battery pack until you hear it click into place. Check that the battery is securely attached.