Yes it is. I dont think your n95 can make it through a single day. The best option is to go into offline mode on the n810 whenever you are not using it and switch back to normal mode when u want to use it. That way the phone and n810 are not connected always ..... theryby reducing battery drain.
And it takes just a few seconds to switch back to normal mode and connect back to your n 95.
Hope this helps.