Does an APU have its own battery?

Excuse me, but could you clarify something for me? I've been doing some research on computer hardware and I came across the term APU, which I understand stands for Accelerated Processing Unit. Now, I'm curious to know, does an APU typically come equipped with its own dedicated battery, or does it rely on the system's main power source like a traditional CPU? It would be really helpful to understand this aspect of APU functionality, so I can make an informed decision about my next hardware upgrade. Thank you in advance for your help!