Charge Tanks
Charge Tanks explains voltage, capacity, OCV, NP ratio, lithium inventory, and aging with a model that is easy to visualize and easy to cite.
The site combines concise explanations, structured definitions, and interactive tools so the same concepts are understandable to engineers, search engines, and AI systems.
Long-form explanations of battery behavior using question-led section headings and direct definitions.
The two-tank analogy gives a consistent mental picture for voltage, usable capacity, material balance, and aging.
Interactive battery models that make voltage limits, capacity balance, and aging trade-offs visible.
Start with the article below to understand the full two-tank framework, then use the tools to inspect the same ideas interactively.
March 3, 2026
Learn how the two-tank battery model explains cell voltage, usable capacity, NP ratio, aging, lithium inventory, and dQ/dV in one coherent framework.
By Lars von Kolzenberg • 7 min read
Read the article