Your question is EIS and DCIR Battery Monitoring. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
From first principles, describe how EIS and DCIR work, and how we use them to monitor batteries.
Explain the measurement principle behind each method, what battery behavior each one is sensitive to, and why the two are complementary. Keep the answer focused on battery monitoring and diagnosis, not chemistry theory in general.