Originally Posted by Tightscot

Thought i'd just add that when using your laptop you should NOT use it with the power lead and battery both connected - this kills the battery over a shorter period of time than normal due to the constant 'trickle charging'

Thought it was a load of rubbish when i heard it but then my second battery failed - after 4 months.

Apparently you should use it on the mains to charge only - disconnect the battery if you want to use it regularly whilst plugged in.

HTH