Mamba Battery Indicator Always 100%

I just got this Razer Mamba Wireless mouse and it always shows 100% in Synapse. I have used it for a little over a day now and the battery percentage is still showing 100%. I know it cant really be at 100%, so it is not updating. When I first got the mouse it was at 30% out of the box and I charged it to 100%. Since then the status has not changed. I want to know how much battery life is left on my mouse so I know when to charge it. I could just charge it when I go to bed every day, but that is kind of annoying as I have many computers and this proprietary cable is the only one that fits to charge the mouse, so I then have to remember to bring the cord with me to charge at whatever computer I am using that day.