So far this is my second mx1000, the first one died after 3min of use. This one seems to have no problems other than the fact the battery just doesn't last. I use my mouse 15 hours a day which is double of what is considered "normal use", however on a full charge i get about 4 days of battery life. After the first day of using it the first bar dissapears. Does this seem like normal battery life expectancy for the ammount of time I use the mouse?