The biggest complaint about the Palm Pre is the battery. Here are some tips to not find yourself with a dead battery before you are ready to go to bed:

1. Sign out of messaging, especially if you are at your computer. Having that always-on connection to AIM and Google Talk will really tap your battery.
2. Turn off the GPS. The navigation app is nice enough to turn it on for you should you forget before you launch it.
3. Disable notifications that you don’t really need. If you want score notifications for an NFL team, don’t leave the app looking for score notifications all week for something that happens in a four hour window on Sunday. Also consider that receiving SMS notifications is less battery-intensive than application notifications (and on Sprint Simply Everything, those are unlimited). Use Twitter/Facebook SMS notifications, score notifications through services like 4info, etc.
4. Close cards that you aren’t using. An active card is an active application. You could unknowingly have a web page that is auto-updating or some other process going on unnecessarily.
5. Choose only calendars that you really need. I know I have a lot of calendars myself, but many of them are ones that I don’t really need to see on my everyday view. If you have 20 calendars like me, choose the 5 that you really want to see.
6. Use WiFi when you can. It uses a lot less power to do data operations over WiFi than Evdo.
7. Use a TouchStone. These things are kind of expensive, but even with the above I don’t think I could get through the day without one. Besides being a handy way to keep the phone charged, it really is a nice functional addition to the phone by making it into a desk clock and making it even easier to answer calls (auto-answer when you pick phone off of stone).
8. Get a bigger battery. There are some after-market batteries available. Unfortunately, except for one made my Seidio that only provides about 20% more life than the stock battery, they require alternative back hatches that make the Pre bigger (and they don’t work with the TouchStone).
9. Get a portable battery charger. While this isn’t a great way on a normal day to stay charged it may be very handy if you’d like to use your pre on a trip and are afraid that you might get to your destination without a charge. There are many of these on the market now that are basically a battery with a USB port that you can plug anything into to get a little charge.

It’s unfortunate that such a great phone otherwise is hampered by this less than adequate battery. If you are not one that uses the phone much to do web browsing/twitter/etc, you may find no issues. My wife has a Pre and while she does some smart-phony stuff with it, she mostly uses the phone and the text messaging and is able to pull almost two days out of the battery.