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You can get your battery replaced at the Workshop of your nearest store.
Under normal conditions of use, your battery will last for about 2 years. It depends largely on how you use it. Using the light and the alarm will use up the battery life more quickly.
You can get your battery replaced at the Workshop of your nearest Decathlon store.
Your watch is waterproof to a depth of 5ATM. This means that you can swim in a pool or the sea with your watch.