You can tell the difference by looking at the back cover of the watch. Snap on covers are by far the most popular covers on modern watches as they’re generally cheaper for the manufacturer to produce, followed by screw on covers. Watches typically have one of three types of covers, covers secured with screws, a screw on cover (the whole back cover turns into place) or a snap on cover. The images here are shown with the newspaper removed as the print distracts from the detail of the image. Start off by placing your watch face down on a magazine or newspaper, the paper will prevent the screen from getting scratched while you work on it.
Some manufacturers will not honour the warranty if the watch has been opened by others. NB – If your watch is still under warranty then please check with your supplier whether they allow you to do your own work on it. Next time your watch dies, try changing the battery yourself, you’ll save money and learn a new trick while you’re busy, it really is a quick and simple job. Taking your watch to the store to get the battery changed might not be an expensive trip but they usually charge you five to ten times more than what the battery itself costs, for a five minute job.