My battery life on my BT mouse seems to be a little shorter too, but the performance has been the real pain! It works fine for a few minutes, then starts stuttering and stopping all over the screen. If I pick it up for a few seconds, until the beam starts flashing very fast, and then go back to using it, it seems to have 'reset' and starts the cycle all over. I've deleted and re-paired it over and over...strange.