He says that you can use and use your battery without accelerating it’s degradation and that keeping a lithium-ion battery fully charged is constantly exposing it to one of its greatest enemies: heat. I say that it’s best to keep it fully charged — that the battery’s enemy is exhaustion of life-cycles. I had once read that the average lithium-ion battery has a life expectancy of 300 cycles. If you cycle it daily, it will die in under a year.

This chart gives good information:
www.batteryuniversity.com/partone-21.htm

So the chart says Tim is right–you can use and use your lithium-ion battery. Heat and deep discharges are the enemy.

It still puzzles me that he’s been through two batteries in four years at school and in the four years I’ve had this PC, I’ve only been through one.  My guess is that it’s because of the deep discharges his experienced while sitting in the dorm lobby watching football.

So — the bottom line: Use your battery in your laptop, but don’t deeply discharge it needlessly.