The battery inside your BlackBerry just may be its most important component. After all, when you're out of the juice, the fun, the work, and everything in between is over&until you can recharge, at least--or pop in a replacement battery.

You can never really comprehend the value of spare BlackBerry batteries until you really need one. So why not just take it from me: You won't regret spending a bit of extra scratch on a replacement battery when your device dies at some inopportune moment, but you're able to simply switch out its power pack.

Pricing on BlackBerry batteries varies by device model, but most can be had for between $20 and $30--less for batteries for older 'Berrys. Currently, a replacement battery just like the one the BlackBerry Bold ships with, , sells for as little as $26 on Amazon.com. retail for about $50 on Amazon, while go for about $55.

Whether or not you use a screen protector on your smartphone seems to be a matter of preference: Some folks love 'em, while others, well...others don't.