I have use my Acer Aspire 4830TG for 1 years, and this week, I got a warning at the battery icon, it say "There is a problem with your battery, so your computer might shut down suddenly". I don't get it , when my laptop fully charge, I discharge my laptop and when the battery low, I charge back my laptop. What should I do, and if there no other solution, what are the price for 4830tg battery replacement? I think my laptop battery have reach it life cycle?

And for your information it happen 3 days ago when I play DIRT SHOWDOWN game , at that time I did not charge my laptop battery and the battery indicator display 80% power left and also I disable my power save button to use NVIDIA Graphic instead of Intel Graphic, after about 3 minute I play the game my laptop suddenly turn off. After that I try power on my laptop but my laptop won't turn on and the power LED blink and that time I consider that my laptop battery are at low level, so I charge the laptop and turn on the laptop and THEN I get that problem. Please help with my problem and what are the solution?