You use your G75VW on a battery?
Such gaming laptops were not designed to run on a battery. The battery is only there for emergencies where you need to use your laptop to surf the net or do some other work. It wouldn't even last more than 30 mins on high performance on a battery anyway
I have never EVER plugged in my battery since day one except one time when I had to update the BIOS and it required the battery to be inserted! But this way, my battery is always unplugged and in brand new condition for when I need it.