|I doubt the issue is the battery. Overheating is caused primary by poor cooling of the processor. The processor may be located under that side of the keyboard.|
I suggest you obtain a can of compressed air from the office supply and blow out the ventilation slots on the bottom of your laptop. Also, only place your laptop on a hard flat surface, which will allow air circulation.
Install HWMonitor to determine the temperatures in real time. Get HWMonitor from the link below.