diff --git a/css/styles.css b/css/styles.css
index b4c26ea..003ed1f 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -862,18 +862,21 @@ footer a:hover {
 }
 
 dialog {
-    position: fixed;
-    top: 50%;
-    left: 50%;
-    transform: translate(-50%, -50%);
-    max-width: 400px;
-    width: 90%;
-    padding: var(--space-xl);
-    background: var(--bg-secondary);
     border: 1px solid var(--border-color);
     border-radius: var(--radius-lg);
     box-shadow: var(--shadow-lg);
     color: var(--text-primary);
+    background: var(--bg-secondary);
+    padding: var(--space-xl);
+    max-width: 400px;
+    width: 90%;
+    max-height: 90vh;
+    overflow-y: auto;
+}
+
+dialog[open] {
+    display: flex;
+    flex-direction: column;
 }
 
 dialog::backdrop {
@@ -910,6 +913,103 @@ kbd {
     border-radius: var(--radius-sm);
 }
 
+/* Import Dialog Styles */
+#import-dialog {
+    max-width: 650px;
+    width: 95%;
+}
+
+.import-instructions {
+    margin-bottom: var(--space-lg);
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+}
+
+.import-examples {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+    gap: var(--space-md);
+    margin: var(--space-md) 0;
+}
+
+.import-example {
+    background: var(--bg-tertiary);
+    padding: var(--space-md);
+    border-radius: var(--radius-sm);
+    border: 1px solid var(--border-color);
+}
+
+.import-example strong {
+    display: block;
+    margin-bottom: var(--space-xs);
+    color: var(--accent);
+    font-size: 0.85rem;
+}
+
+.import-example pre {
+    margin: 0;
+    font-family: var(--font-mono);
+    font-size: 0.75rem;
+    color: var(--text-primary);
+    white-space: pre;
+}
+
+.import-notes {
+    background: var(--bg-tertiary);
+    padding: var(--space-md);
+    border-radius: var(--radius-sm);
+    border-left: 3px solid var(--accent);
+    margin-top: var(--space-md);
+}
+
+.import-notes p {
+    margin: 0 0 var(--space-xs);
+}
+
+.import-notes ul {
+    margin: var(--space-sm) 0 0;
+    padding-left: var(--space-lg);
+    font-size: 0.85rem;
+}
+
+.import-notes li {
+    margin-bottom: var(--space-xs);
+}
+
+#import-textarea {
+    width: 100%;
+    min-height: 200px;
+    padding: var(--space-md);
+    font-family: var(--font-mono);
+    font-size: 0.9rem;
+    background: var(--bg-tertiary);
+    border: 1px solid var(--border-color);
+    border-radius: var(--radius-sm);
+    color: var(--text-primary);
+    resize: vertical;
+    margin-bottom: var(--space-md);
+}
+
+#import-textarea:focus {
+    outline: 2px solid var(--accent);
+    outline-offset: 0;
+    border-color: var(--accent);
+}
+
+#import-textarea::placeholder {
+    color: var(--text-muted);
+}
+
+.dialog-buttons {
+    display: flex;
+    gap: var(--space-md);
+    justify-content: flex-end;
+}
+
+.dialog-buttons .btn {
+    min-width: 100px;
+}
+
 @media (max-width: 640px) {
     .container {
         padding: var(--space-md);
@@ -959,6 +1059,28 @@ kbd {
     .metric-tooltip::after {
         left: 20%;
     }
+
+    dialog {
+        width: 95%;
+        max-width: none;
+        padding: var(--space-lg);
+    }
+
+    #import-dialog {
+        max-height: 85vh;
+    }
+
+    .import-examples {
+        grid-template-columns: 1fr;
+    }
+
+    .dialog-buttons {
+        flex-direction: column-reverse;
+    }
+
+    .dialog-buttons .btn {
+        width: 100%;
+    }
 }
 
 @media (prefers-reduced-motion: reduce) {
diff --git a/index.html b/index.html
index 6d86d9e..a40bbee 100644
--- a/index.html
+++ b/index.html
@@ -56,6 +56,9 @@
                         <button type="button" id="btn-load-example" class="btn btn-ghost">
                             Load Example
                         </button>
+                        <button type="button" id="btn-import" class="btn btn-ghost">
+                            Import
+                        </button>
                         <button type="button" id="btn-clear-all" class="btn btn-ghost btn-danger">
                             Clear All
                         </button>
@@ -331,6 +334,59 @@
         <button type="button" class="btn btn-primary" id="btn-close-shortcuts">Close</button>
     </dialog>
 
+    <!-- Import Data Dialog -->
+    <dialog id="import-dialog">
+        <h2>Import Cell Data</h2>
+        <div class="import-instructions">
+            <p>Paste your cell data below. Supported formats:</p>
+            <div class="import-examples">
+                <div class="import-example">
+                    <strong>Format 1:</strong> Capacity only
+                    <pre>2830
+2700
+2840</pre>
+                </div>
+                <div class="import-example">
+                    <strong>Format 2:</strong> Capacity; IR
+                    <pre>2830; 26
+2700; 25
+2840; 25</pre>
+                </div>
+                <div class="import-example">
+                    <strong>Format 3:</strong> Label; Capacity
+                    <pre>Cell01; 2830
+Cell02; 2700
+Cell03; 2840</pre>
+                </div>
+                <div class="import-example">
+                    <strong>Format 4:</strong> Label; Capacity; IR
+                    <pre>Cell01; 2830; 26
+Cell02; 2700; 25
+Cell03; 2840; 25</pre>
+                </div>
+            </div>
+            <div class="import-notes">
+                <p><strong>Notes:</strong></p>
+                <ul>
+                    <li>Labels must start with a letter and be max 16 characters</li>
+                    <li>Capacity is in mAh (milliampere-hours)</li>
+                    <li>IR (Internal Resistance) is in mΩ (milliohms) and optional</li>
+                    <li>Use semicolon (;) or comma (,) as separator</li>
+                    <li>Empty lines and invalid entries will be skipped</li>
+                </ul>
+            </div>
+        </div>
+        <textarea id="import-textarea" rows="10" placeholder="Paste your data here...
+Example:
+2830; 26
+2700; 25
+2840; 25"></textarea>
+        <div class="dialog-buttons">
+            <button type="button" class="btn btn-primary" id="btn-import-confirm">Import</button>
+            <button type="button" class="btn btn-ghost" id="btn-import-cancel">Cancel</button>
+        </div>
+    </dialog>
+
     <script src="js/app.js"></script>
 </body>
 
diff --git a/js/app.js b/js/app.js
index e0aca92..1f8e8e7 100644
--- a/js/app.js
+++ b/js/app.js
@@ -27,6 +27,7 @@ const DOM = {
     cellTbody: document.getElementById('cell-tbody'),
     btnAddCell: document.getElementById('btn-add-cell'),
     btnLoadExample: document.getElementById('btn-load-example'),
+    btnImport: document.getElementById('btn-import'),
     btnClearAll: document.getElementById('btn-clear-all'),
     statCount: document.getElementById('stat-count'),
     statAvgCap: document.getElementById('stat-avg-cap'),
@@ -62,7 +63,11 @@ const DOM = {
     btnExportCsv: document.getElementById('btn-export-csv'),
     btnCopyResults: document.getElementById('btn-copy-results'),
     shortcutsDialog: document.getElementById('shortcuts-dialog'),
-    btnCloseShortcuts: document.getElementById('btn-close-shortcuts')
+    btnCloseShortcuts: document.getElementById('btn-close-shortcuts'),
+    importDialog: document.getElementById('import-dialog'),
+    importTextarea: document.getElementById('import-textarea'),
+    btnImportConfirm: document.getElementById('btn-import-confirm'),
+    btnImportCancel: document.getElementById('btn-import-cancel')
 };
 
 // =============================================================================
@@ -261,6 +266,132 @@ function loadExampleData() {
     exampleCells.forEach(cell => addCell(cell));
 }
 
+// =============================================================================
+// Import Functionality
+// =============================================================================
+
+function openImportDialog() {
+    DOM.importTextarea.value = '';
+    DOM.importDialog.showModal();
+    DOM.importTextarea.focus();
+}
+
+function closeImportDialog() {
+    DOM.importDialog.close();
+}
+
+function parseImportData(text) {
+    const lines = text.split('\n').map(line => line.trim()).filter(line => line.length > 0);
+    const cells = [];
+    let importedCount = 0;
+    let skippedCount = 0;
+
+    for (const line of lines) {
+        // Support both semicolon and comma as separators
+        const parts = line.split(/[;,]/).map(p => p.trim());
+
+        if (parts.length === 0) {
+            skippedCount++;
+            continue;
+        }
+
+        let label = null;
+        let capacity = null;
+        let ir = null;
+
+        // Parse based on number of columns
+        if (parts.length === 1) {
+            // Format: capacity
+            capacity = parseFloat(parts[0]);
+        } else if (parts.length === 2) {
+            // Could be: label; capacity OR capacity; ir
+            // Check if first part starts with a letter (indicates label)
+            if (/^[a-zA-Z]/.test(parts[0])) {
+                // Format: label; capacity
+                label = parts[0];
+                capacity = parseFloat(parts[1]);
+            } else {
+                // Format: capacity; ir
+                capacity = parseFloat(parts[0]);
+                ir = parseFloat(parts[1]);
+            }
+        } else if (parts.length === 3) {
+            // Format: label; capacity; ir
+            label = parts[0];
+            capacity = parseFloat(parts[1]);
+            ir = parseFloat(parts[2]);
+        } else {
+            // Too many columns, skip
+            skippedCount++;
+            continue;
+        }
+
+        // Validate capacity
+        if (isNaN(capacity) || capacity <= 0) {
+            skippedCount++;
+            continue;
+        }
+
+        // Validate label if provided
+        if (label) {
+            // Must start with letter and be max 16 chars
+            if (!/^[a-zA-Z]/.test(label) || label.length > 16) {
+                skippedCount++;
+                continue;
+            }
+        }
+
+        // Validate IR if provided
+        if (ir !== null && (isNaN(ir) || ir < 0)) {
+            ir = null; // Invalid IR, ignore it
+        }
+
+        cells.push({
+            label: label,
+            capacity: capacity,
+            ir: ir
+        });
+        importedCount++;
+    }
+
+    return { cells, importedCount, skippedCount };
+}
+
+function importCells() {
+    const text = DOM.importTextarea.value;
+
+    if (!text.trim()) {
+        alert('Please paste some data to import.');
+        return;
+    }
+
+    const { cells, importedCount, skippedCount } = parseImportData(text);
+
+    if (cells.length === 0) {
+        alert('No valid cells found in the input. Please check the format.');
+        return;
+    }
+
+    //Remove all cells
+    AppState.cells = [];
+    AppState.cellIdCounter = 0;
+    DOM.cellTbody.innerHTML = '';
+    updateCellStats();
+    updateMatchingButtonState();
+
+    // Add all imported cells
+    cells.forEach(cell => addCell(cell));
+
+    // Show summary
+    let message = `Successfully imported ${importedCount} cell(s).`;
+    if (skippedCount > 0) {
+        message += `\n${skippedCount} line(s) were skipped due to invalid format.`;
+    }
+    alert(message);
+
+    closeImportDialog();
+}
+
 // =============================================================================
 // Weight Sliders
 // =============================================================================
@@ -564,7 +695,11 @@ function setupKeyboardShortcuts() {
         if (e.altKey && e.key === 'a') { e.preventDefault(); addCell(); }
         if (e.altKey && e.key === 's') { e.preventDefault(); if (!DOM.btnStartMatching.disabled) startMatching(); }
         if (e.altKey && e.key === 'e') { e.preventDefault(); loadExampleData(); }
-        if (e.key === 'Escape') { if (AppState.isRunning) stopMatching(); if (DOM.shortcutsDialog.open) DOM.shortcutsDialog.close(); }
+        if (e.key === 'Escape') {
+            if (AppState.isRunning) stopMatching();
+            if (DOM.shortcutsDialog.open) DOM.shortcutsDialog.close();
+            if (DOM.importDialog.open) closeImportDialog();
+        }
         if (e.key === '?' && !e.target.matches('input, textarea')) { e.preventDefault(); DOM.shortcutsDialog.showModal(); }
     });
 }
@@ -574,6 +709,7 @@ function initEventListeners() {
     DOM.cellsParallel.addEventListener('input', updateConfigDisplay);
     DOM.btnAddCell.addEventListener('click', () => addCell());
     DOM.btnLoadExample.addEventListener('click', loadExampleData);
+    DOM.btnImport.addEventListener('click', openImportDialog);
     DOM.btnClearAll.addEventListener('click', clearAllCells);
     DOM.weightCapacity.addEventListener('input', () => updateWeights('capacity'));
     DOM.weightIr.addEventListener('input', () => updateWeights('ir'));
@@ -583,6 +719,8 @@ function initEventListeners() {
     DOM.btnExportCsv.addEventListener('click', exportCsv);
     DOM.btnCopyResults.addEventListener('click', copyResults);
     DOM.btnCloseShortcuts.addEventListener('click', () => DOM.shortcutsDialog.close());
+    DOM.btnImportConfirm.addEventListener('click', importCells);
+    DOM.btnImportCancel.addEventListener('click', closeImportDialog);
 }
 
 // =============================================================================