How are ADP and ATP are each like a battery which is partially charged and which one is fully charged why?

ATP (adenosine triphosphate) is like a fully charged battery because it contains three phosphate groups, which store a significant amount of energy that can be released when the terminal phosphate group is removed, transforming it into ADP (adenosine diphosphate). ADP, with only two phosphate groups, represents a partially charged battery, as it has less stored energy compared to ATP. When ADP is recharged by the addition of a phosphate group, it can regenerate ATP, similar to recharging a battery.