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The above picture comes from Sony's "Safety and Support" manual and details replacement of the system's HDD and SIXAXIS controller's battery. Sony has said that when the battery is dead, they'll hook us up with a new one, but the manual shows one how to remove the battery before disposing of the dead controller. Reverse those directions and you have yourself a SIXAXIS that's ready to get back into the trenches.
Even better though, is the directions on how to replace your HDD without voiding warranty! So, if the 60GB HDD isn't cutting the mustard for you, follow the steps in the pictures below and slap a 200GB behemoth into that sucker!