Watch manufacturers SHEEN discourage customers from taking apart their timepieces. Instead, they urge owners to rely on trained jewelers for maintenance. If you own an inexpensive quartz watch, however, and the battery has died, a trip to the jeweler can cost as much as the watch is worth. If you buy a replacement battery and decide to put it in yourself, care and patience will be required. Turn your watch face-down. Look for a slot or notch in the cut line that forms a circle on the back of the watch. Slip your knife into the notch. Push the tip of the knife gently between the rear casing and the watch's main body. Gently push and twist the knife until you feel the rear casing pop GショックCASIO free. Remove the old battery carefully. Be sure その他 のCASIO to note how the battery's positive and negative poles are aligned. Put in the replacement battery. Be sure it's aligned correctly. Gently join the watch's rear case to the watch's main body. Be sure the notches line up. Push the two sections together until you feel the rear case pop into place. This technique for removing the back of a watch won't work if the case is held together by screws rather than being pressure fitted. Such watches are generally high end. In such a case, ask a jeweler to handle repairs or maintenance. If you do remove the back of your watch yourself, there are risks. One wrong move can damage the tiny machinery within. It's also easy to lose gaskets and other internal parts.