A mercury-free lead-free button battery includes a negative cap, a cathode material, a gasket ring, a positive can, an anode material, and a diaphragm. The positive can and the negative cap are combined. The gasket ring is clamped between the positive can and the negative cap for separating the positive can from the negative cap. The cathode material is arranged on the bottom of the positive can. The diaphragm is arranged on the cathode material. The anode material is arranged between the negative cap and the diaphragm. A partition unit is arranged between the negative cap and the anode material for separating the anode material from the negative cap and conductively connecting the anode material and the negative cap. The partition unit ensures disconnection between the anode material and the negative cap and therefore safety of the battery by preventing expansion, weeping and even that would otherwise happen.