> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ionworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 2026 03 09

<Update label="March 9, 2026" description="Multi-measurement comparison, cycle aging simulations, and improved optimizer convergence">
  ## Multi-measurement comparison view

  Select multiple measurements in the Cell Data table and click "Compare" to open a dedicated comparison page. The Time Series tab plots measurements on the same chart with configurable axes and a stack-cycles mode, while the Cycles tab shows cycle metrics like discharge capacity and coulombic efficiency across all selected measurements with optional retention mode. Filters can be applied globally or per-measurement.

  [Find out more →](/data/visualizing)

  ## Cycle aging simulation template

  A new cycle aging template is available for simulations, allowing you to define cycling protocols and visualize cycle-level metrics such as capacity fade and efficiency over hundreds of cycles.

  [Find out more →](/simulate/experiment-templates#9-cycle-aging)

  ## Improved optimizer convergence

  The Differential Evolution optimizer now has better initial coverage of the parameter space and improved reproducibility. These changes improve convergence reliability across a wide range of fitting problems.

  <AccordionGroup>
    <Accordion title="Studio">
      **Improvements**

      * Simulations can now be force-rerun while preserving the same simulation ID and study mappings.
      * The data list table now shows expanded specification columns (anode, cathode, electrolyte, case sub-fields), copy-on-click IDs, and a search-on-this-page feature.
      * EIS and dV/dQ data can now be viewed in dedicated tabs on measurement detail pages.
      * Cycler simulator jobs now provide live partial-result updates during execution.
      * Parameter sets are now dynamically discovered rather than hardcoded, so newly installed parameter sets appear automatically.
      * The API now includes a discovery endpoint to help programmatic clients understand available capabilities and schemas.
      * Cell creation no longer requires anode and cathode to be defined upfront, simplifying the model creation workflow.

      **Fixes**

      * Fixed stale data appearing after switching organizations.
      * Fixed a bug where model options were missing from design optimization jobs.
      * Fixed PyBaMM expression parameters not being handled correctly during parameterized model creation.
    </Accordion>

    <Accordion title="Pipeline">
      **Improvements**

      * Composite models now support nested list/tuple options (e.g. open-circuit potential configurations).
      * Capacity calculations now correctly account for the number of electrodes in parallel.
      * Validation runs now surface simulation errors immediately instead of silently filling results with sentinel values.
      * Custom initial state support added for lumped SPMr and ECM models, accepting either a voltage string or SOC float directly.

      **Fixes**

      * Fixed drive cycle step data losing interpolant data during roundtrip.
      * Fixed EIS simulation including unnecessary output variables.
      * Fixed NaN values in simulation results causing constraint actions (GreaterThan/LessThan) to crash instead of returning penalty values.
    </Accordion>

    <Accordion title="Python API">
      **Improvements**

      * Added an API discovery skill to help agents explore available endpoints and schemas.
    </Accordion>

    <Accordion title="Data Processing">
      **Improvements**

      * Data loading now accepts environment configuration for database connections.
      * Step detection now checks the last step after the first for more reliable step boundary identification.

      **Fixes**

      * Fixed a data loading issue that could fail when cloning previously loaded data.
    </Accordion>

    <Accordion title="Protocol Simulator">
      **Fixes**

      * Fixed a drive cycle temperature handling bug.
      * Added validation that safety limit minimums must be less than maximums, preventing misconfigured protocols.
      * Fixed a bug where initial SOC parameter values were not saved for later variable evaluation.
      * Fixed Maccor parser not recognizing constant-power/constant-voltage (CPCV) protocol steps.
    </Accordion>
  </AccordionGroup>
</Update>