How does Internal Resistance affect Performance? - Battery University
A critical overview of definitions and determination techniques of the internal resistance using lithium-ion, lead-acid, nickel metal-hydride batteries and electrochemical double-layer capacitors as examples - ScienceDirect
ALLOSUN Battery Internal Resistance Meter / Battery Voltage Tester / Digital Battery Analyzer CECOMINOD062345: Amazon.com: Tools & Home Improvement
The basic knowledge of RC battery internal resistance - GensTattu