how to stop binatona sympony 2210 from beeping all the time?

I purchased new binatone symphony 2210 and installed it.according to installation instructions I have to charge it for 15 hrs before I use it for the irst time. so I kept it for charging overnight but since I connected it it is beeping all the time.manual says that the handset will give a beep when it is properly placed on the base or charger..but how long will it keep beeping? it is almost 15 hrs now,its still charging and beeping..somebody pl help me.