You need to 'tell' the handset that it has a new battery: Charge the new one a few mins then punch in 9#9#9*655, then depress the center button.  It should beep several times.  Also, those phones are very fussy about which batteries will work with them.  Best to get the proper replacement from B&O.

Hi milanoli

You have to register the Beocom to the base-station. If you have a regular PSTN-base, you have to push the button on the back of the base for 4 seconds. Then the base is ready to register your beocom for about 5 minutes. If you have a ISDN-base, disconnect it from the mains for 2 seconds, then reconnect.

To register the beocom , you have first to press the mid button to switch on, then the phone symbol. The phone asks you "Register BASE?"-> OK

I hope this helps. Some times you just have to "Reboot" your base station to let things work again.

We have 3 Beocom 6000 and a ISDN base station working for 11 years now and only had one serious trouble when my wife put one of the sets under water. Thanks to the immediate help from one of the members of this forum even this set still works.

Good luck, David 

Thanks for your replies. Problem is the phone just turns itself off after 2 seconds so i dont get chance to try any of the suggestions! Leaving the phone on the Charging base has no effect....

Possibly an incompatible battery.

Thank you Beoworld Forum members !!

Came home tonight to the problem "the phone does not work !"

Problem was not power, battery - my first assumption - but rather no dial tone and no calls into the 6000 (but they did pass through to our BeoTalk) ...

So after checking all connection to the Beocom 6000 and the Beotalk 1200 and making sure there was connective to the Base I resorted to a search in the forum and found this entry ...

beowild wrote:

Some times you just have to "Reboot" your base station to let things work again.

So I switched the Base off for 10 seconds, powered back on, and bingo we had the dial tone back.

Thanks guys !!