Revert "feat: start adding battery models"

This reverts commit f8b8872.

Author: lymichelle21

examples/03_Existing Models.ipynb

@@ -542,13 +542,6 @@
     "## Centrifugal Pump Model"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## Electric Powertrain Models"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -566,28 +559,16 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": ".venv",
    "language": "python",
    "name": "python3"
   },
   "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
    "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.10.5"
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "610c699f0cd8c4f129acd9140687fff6866bed0eb8e82f249fc8848b827b628c"
-   }
-  }
+   "version": "3.12.9"
+  },
+  "orig_nbformat": 4
  },
  "nbformat": 4,
- "nbformat_minor": 4
+ "nbformat_minor": 2
 }