The best way to ensure that your BlackBerry PlayBook tablet always has battery life is to charge it whenever possible. When you're sitting at your desk working, plug in your PlayBook. When you're on the couch surfing the Web, keep the tablet charging. It may sound like a bit of a no-brainer, but the more frequently you charge your tablet, the less likely it is to run out of power when you need it the most. (Note: RIM recently suggested "cycling" your PlayBook battery following the BlackBerry Tablet OS update to v220.127.116.118, so you may want to fully discharge then recharge your battery a few times.)
To ensure that you can always charge your PlayBook when you have access to a power outlet, it's a good idea to pick up an extra charger or two; one for home, one for the office, etc. However, it's worth noting that you should not use a BlackBerry smartphone charger to power up your PlayBook. The two devices require a different charging current, and not only will it take much longer to power up your tablet if you're using a normal BlackBerry smartphone charger, your tablet isn't likely to receive a full charge.
RIM also offers a couple of "rapid charging" accessories: the BlackBerry PlayBook Rapid Charger; and the PlayBook Rapid Charging Pod. Though I haven't used either of them and therefore can't attest to their effectiveness, RIM says the rapid charging accessories can power up your tablet in half the time of the standard PlayBook charger. (Neither accessory is cheap, though, at $70.00 each.)
Properly Manage PlayBook Multitasking, Close Unused Apps
The BlackBerry PlayBook is a multitasking powerhouse. But real multitasking--leaving many apps open or active while switching back and forth between them--can drastically increase your PlayBook's power consumption.
First things first, it's a good idea to get into the habit of closing PlayBook apps whenever you're finished using them. This will help ensure that those apps aren't draining any valuable power, and your PlayBook will perform better overall with fewer open applications. To close a PlayBook app, simply exit out of it by swiping your finger upwards from the bottom of your display, then click the tiny "X" that appears beneath it. You can also swipe upwards again from the minimized app to the top of your display to "flick" it closed.
The BlackBerry PlayBook offers users a few different multitasking "modes," one of which will drain more PlayBook battery than the others when used carelessly. To access the various PlayBook Application Behavior settings, open up your PlayBook settings menu by tapping the gear-icon in the top-right corner of your PlayBook's home screen. Next, select the General option, and you'll see a section for Application Behavior.