Battery watcher for MacOS to prevent you from overcharging or running your battery down too low

"The 40-80 rule suggests that lithium-ion batteries should be kept within a specific state of charge (SOC) range for optimal performance and lifespan. According to this rule, it is best to charge the battery when it reaches around 40% SOC and stop charging when it reaches around 80% SOC. "

• https://www.vatrerpower.com/blogs/news/understanding-the-40-80-rule-for-lithium-ion-batteries