Replacing a watch battery is a DIY project within the capability of anyone. For about $10 in tools (the cost of a typical battery replacement at the jeweler), you can have a fun time doing it yourself. The only reason why you may NOT want attempt it is if you are worried about accidentally scratching the back's finish.
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If you want to give this project a try, you will need two tools. The first is a small screwdriver or a pin-retractor. The pin-retractor will make taking the band off much easier. The other tool is an adjustible case opener. This tool is used to open the back of the watch.
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To open the case, adjust the case opener so all the pins are aligned with the channels on the back of the case. Rotate the tool counter-clockwise to open.
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Once the back has been removed, you can see what type of battery powers the unit. In this case, it is a Renata 399 button battery. Most watch batteries are easy to find. However, if you want it cheap, get it on EBay. We purchased ours on EBay for about $0.25 each.
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Replacing the battery is a simple matter of popping out the old one and putting in the new one. Before taking out the old one, though, do note the polarity (+/-) orientation. Trust us on this little tip. - Wan Chi Lau (permalink)
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