Dynamic battery charging voltage optimization for the longer battery runtime and lifespan

When a battery is kept to be fully charged, battery lifespan is reduced due to storage deterioration. When a battery is often charged and discharged, battery lifespan is also reduced due to cycle deterioration. The Dual Mode battery introduced in this paper provides Runtime mode and Lifespan mode for laptop PCs to balance the battery runtime and lifespan. A battery is charged by a higher charging voltage in Runtime mode to get the longer battery runtime, while the battery is charged by a lower charging voltage in Lifespan mode to get the longer battery lifespan. This paper discusses automatic mode switching between Runtime mode and Lifespan mode by monitoring battery usage, and proposes the algorithm to get both the long battery runtime and the longer battery lifespan. This paper also shows that how battery lifespan is increased by the proposed algorithm based on the user tests conducted over 1 year.