diff --git a/stock_picking_batch_custom/i18n/es.po b/stock_picking_batch_custom/i18n/es.po
new file mode 100644
index 0000000..c38c173
--- /dev/null
+++ b/stock_picking_batch_custom/i18n/es.po
@@ -0,0 +1,28 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* stock_picking_batch_custom
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 18.0\n"
+"POT-Creation-Date: 2026-03-30 00:00+0000\n"
+"PO-Revision-Date: 2026-03-30 00:00+0000\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: es\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+#. module: stock_picking_batch_custom
+#. odoo-python
+#: code:addons/stock_picking_batch_custom/models/stock_picking_batch.py:0
+msgid "You must mark all product lines as collected before validating the batch."
+msgstr "Debes marcar todas las líneas de producto como recogidas antes de validar el lote."
+
+#. module: stock_picking_batch_custom
+#. odoo-python
+#: code:addons/stock_picking_batch_custom/models/stock_picking_batch.py:0
+msgid "Pending products: %(products)s"
+msgstr "Productos pendientes: %(products)s"
diff --git a/stock_picking_batch_custom/i18n/eu.po b/stock_picking_batch_custom/i18n/eu.po
new file mode 100644
index 0000000..7fe2682
--- /dev/null
+++ b/stock_picking_batch_custom/i18n/eu.po
@@ -0,0 +1,28 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* stock_picking_batch_custom
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 18.0\n"
+"POT-Creation-Date: 2026-03-30 00:00+0000\n"
+"PO-Revision-Date: 2026-03-30 00:00+0000\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: eu\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+#. module: stock_picking_batch_custom
+#. odoo-python
+#: code:addons/stock_picking_batch_custom/models/stock_picking_batch.py:0
+msgid "You must mark all product lines as collected before validating the batch."
+msgstr "Produktu-lerro guztiak jasota gisa markatu behar dituzu lotea balioztatu aurretik."
+
+#. module: stock_picking_batch_custom
+#. odoo-python
+#: code:addons/stock_picking_batch_custom/models/stock_picking_batch.py:0
+msgid "Pending products: %(products)s"
+msgstr "Zain dauden produktuak: %(products)s"
diff --git a/stock_picking_batch_custom/models/stock_picking_batch.py b/stock_picking_batch_custom/models/stock_picking_batch.py
index c2c77fc..798678c 100644
--- a/stock_picking_batch_custom/models/stock_picking_batch.py
+++ b/stock_picking_batch_custom/models/stock_picking_batch.py
@@ -4,6 +4,7 @@
 from odoo import api
 from odoo import fields
 from odoo import models
+from odoo.exceptions import UserError
 
 
 class StockPickingBatch(models.Model):
@@ -139,6 +140,31 @@ class StockPickingBatch(models.Model):
             else:
                 batch.summary_line_ids = [fields.Command.clear()]
 
+    def _check_all_products_collected(self):
+        """Ensure all product summary lines are marked as collected before done."""
+        for batch in self:
+            not_collected_lines = batch.summary_line_ids.filtered(
+                lambda line: not line.is_collected
+            )
+            if not not_collected_lines:
+                continue
+
+            product_names = ", ".join(
+                not_collected_lines.mapped("product_id.display_name")
+            )
+            message = batch.env._(
+                "You must mark all product lines as collected before validating the batch."
+            )
+            if product_names:
+                message += "\n" + batch.env._(
+                    "Pending products: %(products)s", products=product_names
+                )
+            raise UserError(message)
+
+    def action_done(self):
+        self._check_all_products_collected()
+        return super().action_done()
+
 
 class StockPickingBatchSummaryLine(models.Model):
     _name = "stock.picking.batch.summary.line"
diff --git a/stock_picking_batch_custom/tests/test_batch_summary.py b/stock_picking_batch_custom/tests/test_batch_summary.py
index e8139e9..07f2518 100644
--- a/stock_picking_batch_custom/tests/test_batch_summary.py
+++ b/stock_picking_batch_custom/tests/test_batch_summary.py
@@ -1,6 +1,7 @@
 # Copyright 2026 Criptomart
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
+from odoo.exceptions import UserError
 from odoo.tests import tagged
 from odoo.tests.common import TransactionCase
 
@@ -287,3 +288,27 @@ class TestBatchSummary(TransactionCase):
             lambda line: line.product_id == product2
         )
         self.assertAlmostEqual(line_product2.qty_demanded, 10.0)
+
+    def test_done_requires_all_summary_lines_collected(self):
+        """Batch validation must fail if there are unchecked collected lines."""
+
+        batch = self._create_batch_with_pickings()
+        batch.action_confirm()
+        batch._compute_summary_line_ids()
+
+        self.assertTrue(batch.summary_line_ids)
+        self.assertFalse(batch.summary_line_ids.mapped("is_collected")[0])
+
+        with self.assertRaises(UserError):
+            batch.action_done()
+
+    def test_check_all_products_collected_passes_when_all_checked(self):
+        """Collected validation helper must pass when all lines are checked."""
+
+        batch = self._create_batch_with_pickings()
+        batch.action_confirm()
+        batch._compute_summary_line_ids()
+        batch.summary_line_ids.write({"is_collected": True})
+
+        # Should not raise
+        batch._check_all_products_collected()