I would charge the battery completely, then remove the battery and keep the laptop plugged in and only put the battery back in when you need to move.

Yes, They have good cheap batteries for everything. Our camcorder batteries and also a tripod for your laptop. It have good prices and they work great. Batteries Plus has a lot of batteries, and have a good warranty on them as well.

Batteries degrade over time. The circuity builds electrical resistance over time. Chemically, the cells are fine. After three years they provide the same amount of capacity and voltage. It's just the circuitry that has the resistance is the cause of the perceived battery drain. More resistance obviously means it needs to use more power to provide the same level of power that it could a year or two earlier.

If you want to preserve your battery, drain it to around 40% capacity left and then store it in a freezer or a fridge. This way a battery loses only 4% of its capacity a year, compared to having it fully charged and storing it which it loses around 20%-40% of it's capacity already. Even discharging it to 40% and then storing it at room temperature yields around I think a 6-10% decrease in battery life.

Don't listen to the guy who said to discharge the battery completely. If you do that and recharge it, the battery possibly may not recharge at all or could cause a fire, etc. You get the idea.

Usually the battery storage is quite impractical. I mean who is going to discharge it at 40% and then store it in a fridge? What if you need it at 100% the next day? Enjoy the battery while you can! buy a new one later down the road. It is something that we can't all avoid.