Transcript
Please Read This FIRST
Terms of Use This BEGINNER WATCHMAKING book is Copyright © DEC. 2010. All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted by any means; electronic, mechanical, photo copying, recording or otherwise, without written permission from the copyright holders. You do not have any right to distribute any part of this paperback book or electronic book in any way at all. Tim Swike and indyebooks are the sole distributors. Violators will be prosecuted. Adjusting, changing, adding, or removing the mechanical or electronic parts in any device can be dangerous and can cause injuries. The author of this book assumes no responsibility for personal injury or property damage caused by the use of this guide, or products we use or sell, whether by accident, negligence, or otherwise. Please note that this book is intended for educational purposes only. Only qualified personnel should carry out any watch building or repair work. USE AT YOUR OWN RISK.
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Copyright 2010 ISBN-13:
978-1456451653 ISBN-10:
1456451650
Since watch batteries, or button cells, are not all removed the same way, I thought it might be a good idea to review a few of the more common battery removal processes. Most of the batteries you encounter will be held in place by a metal strap, or tab, which applies pressure to the top or side of the watch battery, which keeps it in place. If the strap moves, then you can use your metal dental pick tool or a small screwdriver to push the strap to the side, and pry out the battery. If the strap does not move, then use your pick or screwdriver to pry out the battery from the opposite side, across from the strap. If there is a screw on the strap, then use your screwdriver to loosen the screw a few turns. Once loose, the battery can be pried out. Be careful !!! Do not loosen this tiny screw all the way. If this screw falls out, it can be a huge pain to put it back in, which involves holding the screw with tweezers, and then screwing it back in place. Note: The positive part of the watch battery is located on the top and sides, and it is marked with a + sign. The negative part of the battery is located on the opposite side, inside the insulated circular cap. Both sections need to be touched by a strap, or tab, in order to make the circuit work. You might want to consider using plastic tweezers to reinstall the battery, or add tape to your tweezers. You don’t want to accidentally connect the positive and negative sides with your tweezers, as it could use up some of the juice.
Here are some common ways that batteries are held in place.
Here are the two sides of the battery. When you install the battery in the movement, the positive side is visible. The negative side is not.
Take a look at these movements. In this first group, the batteries can be pried out with a small screwdriver. They have a strap, or tab, on the side that holds the battery in place. The tab on the bottom touches the negative side of the battery. It is when the battery is installed.
These next movements are a little different. The movement on the left has a strap that rotates on and off of the battery for easy removal. The movement on the right has a small screw that needs to be loosened first before the battery can be pried off.
If you need to test a battery, all you need is a basic multimeter. Set it to the low voltage setting and connect one probe to the positive side, and one probe to the negative side. You can use an alligator clip for the positive connection, since the positive part of the battery also includes it’s sides. The battery I am testing is a very common one for quartz watches. It is a Maxell 626SW, which is a high quality 1.5V silver oxide battery made in Japan. Silver oxide yields a consistent power output, which is needed for watches. This battery is also known as a model 377 battery, which means it has a size of 6.8 x 2.6mm. This battery also has a 5 year shelf life.
My multimeter reading for this battery was 1.56V.
Here is a chart from Wikipedia detailing most of the watch batteries that can be found in quartz watches. http://en.wikipedia.org/wiki/List_of_battery_sizes
