An electrolytic capacitor is a widely used, passive component in electronics and the manufacturing industry. But it is known for its low reliability when used in critical applications and environments. The prediction of the residual life of a capacitor is a challenging issue. It is beneficial for users as they will be ready to replace a component when it is faulty. This will save them replacement and repairing costs. This paper focusses on the mathematical modelling and behaviour analysis of electrolytic capacitors related to various electrical parameters and environmental stresses. A novel method is proposed to access the impact of humidity on the health of a capacitor. A capacitor's end of life is explored using the design of experiments approach. After calculating the lifetime of a capacitor, an expert system is modelled that can predict the sudden crash of the capacitor before it actually fails, using various statistical and analytical techniques. A comparison was done using the experimental calculated lifetime and proposed analytical method outcome. The proposed corrective model of lifetime calculation proves 92.76% accuracy. This shortfall is due to the fact that some electrical and environmental variables change at a pace that is too fast for the prediction system to respond.