A gaing PC has high performance components such as GPU, possibly NVIDIA GeForce RTX or AMD Radeon RX, multi-core, high-speed CPUs, and higher RAM and storage.
A strong battery life is one of the core factor to be considered when getting a gaming pc. It is certainly going to be important to also consider the processor before getting a new gaming pc if you are looking to achieve a better gaming experience.
A gaming PC can be characterised with its high performance. What makes the difference is the high refresh rate monitor, dedicated GPUs, cooling systems and upgradeability not like a regular computer.