Omega is a world renowned watch maker with elegant time pieces for both men and women. Omega has a distinguished history. Their watches have traveled to the moon six times. They were the first company to make a diver's watch and today they make "the world’s only certified marine chronometer wristwatch," according to the Omega website. It is from this proud tradition that the Seamaster series was born. Not all Seamaster watches contain batteries, but the Seamaster Quartz series does. Batteries are easy to change, although you should refrain from doing so during the warranty period.
Lay the watch face down on the soft cloth to protect the face and watch case from scuffs and scratches. Before proceeding, ensure that the work area is clean and free of dust and lint that could get trapped in the watch mechanism.
Remove the back plate. Most Omega Seamasters have screws holding the back plate in, but some older models and women's models have a pop-up plate. If your Seamaster has screws, use the watch case wrench to loosen the screws. Turn the screws in a counterclockwise direction. Remove the screws and put them in a safe place. If your back plate has small grooves along the side, slide the flat-head screwdriver into one of the grooves and gently apply upward pressure. Do the same with the other grooves until the plate becomes loose and pops off.
Prise the battery from under the battery strap, gently, using the flat-head screwdriver. Take great care when doing so to avoid damaging the surrounding components. Take note of the battery's orientation. Using the old battery's serial number, order a replacement battery from a jeweler or online.
Slide the new battery in under the battery strap. Use the tweezers to do so as the salt and oil from your hands will corrode the battery. Make sure the new battery is facing the same direction as the old battery.
Replace the back plate. If you have a pop-out plate, apply gentle pressure until the plate clicks back into place. If you have a screw-in plate, replace the screws using the watch case wrench and turn in a clockwise direction.