Overcharging your lithium-ion battery can cause it to overheat and damage it. To know if a lithium battery is about to explode, watch for signs like swelling or bulging of the battery casing, excessive heat generation, leakage or hissing noises, a strong chemical smell, or discoloration of the battery or device. If you observe any of these symptoms, it’s crucial to immediately stop using the device, move it to a safe area away from flammable materials, and consult with a professional for safe disposal or replacement.