Which battery to choose?
First of all, you should know that there are different types of watch batteries, also called button batteries. You may have already noticed that a button cell has different information on it. The numbers and letters on a battery are called the battery number. The letter L indicates an alkaline battery. It delivers a voltage of 1.5 V. The letter S indicates a silver oxide battery, which delivers a voltage of 1.55 V. The letter C designates a lithium battery which delivers a voltage of 3 V. Thanks to these letters, you can know the chemical composition and the type of button cell that your watch requires. Batteries are also differentiated by their size and thickness, which can vary between 5 and 20 mm in size and between 1 and 6 mm in thickness.