Because ATP stores energy and releases it turning into ADP in the process. This ADP is then converted back to ATP by the cells so that its energy is ready when required, just like a rechargeable battery.
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ADP and ATP are like a battery because they store and release energy for cellular processes. ADP is like a partially charged battery, while ATP is like a fully charged battery ready to provide energy when needed. Just like a battery, the conversion between ADP and ATP allows cells to efficiently use energy for various functions.
Think of ATP (and ADP) as a battery ... storing energy to be used as needed.
When ATP is used, it becomes ADP or Adenine Di-Phosphate. Adding another phosphate will "recharge" ATP.
ATP is called the energy source (battery) of the cell.
ATP (Adenosine triphosphate) is often referred to as the cells' "battery substance" because it is used as a coenzyme in reactions that require energy. It is produced in cellular respiration (using nutrients) from AMP (~ monophosphate) and ADP (~ diphosphate); in this process it basically gains phosphate groups. ATP then often binds to enzymes, transferring phosphate groups and that way energy. Note that ATP has other uses and is also one of the basic components of DNA.