Is there a way to improve the battery performance of my PLC tablet?

The PLC tablets work best when in "High Performance" mode. However, if you need more life, there is a "Balanced" performance mode in the HCL settings that could be chosen.

Use Balanced Power Mode

On your tablet, go to Settings > General Settings:

Then, simply choose between "Balanced" or "High Performance" per your preference. You will experience longer battery life in balanced, but heavier CAD files, such as 3D files, may have a longer or delayed time to navigate on screen.