[legion]

The battery will last 3-5 years, so don't sweat it.

My work laptop (which has two HUGE batteries) I frequently run for 8 hours straight without pluggin in. I expect the battery to last about 3 years.

My home laptop's battery just died after 5 years. The good news is that you can get new laptop batteries for obsolete models for cheap. I just paid $70 shipped for a new 12-cell battery (to replace the dead 6-cell). I get about 4 hours from a charge now.

I expect by the time you need a new battery (3 years if you really abuse it), it will be around $35 for a new one...