I have Compaq presario v6604au notebook and i have got a battery issue. Since i bought this notebook nearly 18 months ago as a desktop replacement so it is always plugged in to the power supply and now it has been showing its adverse effects. My battery life has diminished to nearly 50% of original. so my question is, as i have stated above can i manually stop my battery from charging even if its plugged in and charge it whenever i want except from removing my battery because it serves as my UPS. Thanks in advance.