I believe I've alluded to the fact that while I remain fully dedicated to my desktop, four years ago I also bought myself a used, cheap laptop on ebay. It was pretty low end when I bought it back then, and is ridiculously so now. But you know what? It still works for minor web browsing, word processing, and its battery still holds a charge. I bring it along whenever I go on long trips, like when I go back to my hometown.
I still use it every night to read comic books. I keep it by my bed like you would your favorite novel.
Most recently I've started to notice that the battery's capacity has gone considerably down since I started using it in 2004. I think it holds at most just an hour's worth of charge now (when it used to be almost 3). It's normal for these batteries to lose reliability after this much use, but it's still worth trying to keep it going for as long as possible.
This tip on, appropriately, One Tip A Day, suggests removing the battery when you're not using it. Commenters have observed that this doesn't nearly do as much saving as you'd think, but it certainly wouldn't hurt for people like me that keep their laptops plugged in 99% of the time. It is, after all, that 1% that matters the most.
Here's hoping I can make my laptop last at least another year or two. I already love how it runs just as fast if not faster than my sister's laptop, which hardly holds a charge anymore and takes many more minutes to start up, but was bought new after I bought my used one.