http://mobileoffice.about.com/od/usingyourlaptop/f/laptopbattery.htm
Question: Should I Remove the Laptop Battery For A Desktop Replacement Laptop?
Leaving a battery in a laptop while using an electrical outlet for long periods of time will keep the battery in a constant state of charging up and that will reduce the life cycle of the battery.
http://www.batteryuniversity.com/parttwo-34.htm
How to prolong lithium-based batteries
http://www.zbattery.com/laptopbatterycare.html
"2.) Do not keep your laptop battery installed when you use your laptop on AC for an extended period of time.
More importantly than the trickle charger affect is the 'storage' of a Li-Ion battery at elevated temperatures. The optimum storage temperature for a Li-Ion battery is at 0 deg. C. The optimum storage charge level is a
pirms 15 gadiem
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