Usually, button batteries with a "+" mark indicate the positive pole, while the back indicates the negative pole; The shell at the edge of the button battery is also the positive electrode, so the vast majority of button batteries loaded on the button battery holder have the positive electrode facing upwards. This is because there are metal spring pieces on the side of the button battery holder that clamp the button battery to prevent it from coming out. This is the positive electrode metal spring piece, which will tightly adhere to the positive electrode edge of the button battery. Due to the large area of electrode contact between the positive electrode metal spring pieces, the stability of electrode contact is effectively improved; If the positive and negative poles of the button battery are swapped, it can still hold the battery, but the battery will short circuit.
How to remove the battery from the button battery holder
The accessory with a button battery holder on the product is convenient for replacing old and new button batteries. The metal spring can be easily moved, and a careful look will reveal the method of removing the button battery. Some button battery holder designs may require an insulated plastic sheet to assist in removing the button battery.