diff --git a/src/Entity/SAPBattery.php b/src/Entity/SAPBattery.php
new file mode 100644
index 00000000..4a482b43
--- /dev/null
+++ b/src/Entity/SAPBattery.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Common\Collections\ArrayCollection;
+use Symfony\Component\Validator\Constraints as Assert;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="sap_battery")
+ */
+class SAPBattery
+{
+    // battery sku
+    /**
+     * @ORM\Id
+     * @ORM\Column(type="string", length=25)
+     */
+    protected $id;
+
+    // brand
+    /**
+     * @ORM\ManyToOne(targetEntity="SAPBatteryBrand", inversedBy="batteries")
+     * @ORM\JoinColumn(name="brand_id", referencedColumnName="id")
+     */
+    protected $brand;
+
+    // size
+    /**
+     * @ORM\ManyToOne(targetEntity="SAPBatterySize", inversedBy="batteries")
+     * @ORM\JoinColumn(name="size_id", referencedColumnName="id")
+     */
+    protected $size;
+
+
+    public function __construct()
+    {
+    }
+
+    public function setID($id)
+    {
+        $this->id = $id;
+        return $this;
+    }
+
+    public function getID()
+    {
+        return $this->id;
+    }
+
+    public function setBrand($brand)
+    {
+        $this->brand = $brand;
+        return $this;
+    }
+
+    public function getBrand()
+    {
+        return $this->brand;
+    }
+
+    public function setSize($size)
+    {
+        $this->size = $size;
+        return $this;
+    }
+
+    public function getSize()
+    {
+        return $this->size;
+    }
+}
diff --git a/src/Entity/SAPBatteryBrand.php b/src/Entity/SAPBatteryBrand.php
new file mode 100644
index 00000000..bd7c6a6b
--- /dev/null
+++ b/src/Entity/SAPBatteryBrand.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Common\Collections\ArrayCollection;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="sap_battery_brand")
+ */
+class SAPBatteryBrand
+{
+    // unique id
+    /**
+     * @ORM\Id
+     * @ORM\Column(type="integer")
+     * @ORM\GeneratedValue(strategy="AUTO")
+     */
+    protected $id;
+
+    // name
+    /**
+     * @ORM\Column(type="string", length=50)
+     * @Assert\NotBlank()
+     */
+    protected $name;
+
+    // battery
+    /**
+     * @ORM\OneToMany(targetEntity="Battery", mappedBy="size")
+     */
+    protected $batteries;
+
+    public function __construct()
+    {
+        $this->batteries = new ArrayCollection();
+    }
+
+    public function getID()
+    {
+        return $this->id;
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+        return $this;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function addBattery(Battery $battery)
+    {
+        $this->batteries->add($battery);
+        return $this;
+    }
+
+    public function clearBatteries()
+    {
+        $this->batteries->clear();
+        return $this;
+    }
+
+    public function getBatteries()
+    {
+        return $this->batteries;
+    }
+}
diff --git a/src/Entity/SAPBatterySize.php b/src/Entity/SAPBatterySize.php
new file mode 100644
index 00000000..1f38ca96
--- /dev/null
+++ b/src/Entity/SAPBatterySize.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Common\Collections\ArrayCollection;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="sap_battery_size")
+ */
+class SAPBatterySize
+{
+    // unique id
+    /**
+     * @ORM\Id
+     * @ORM\Column(type="integer")
+     * @ORM\GeneratedValue(strategy="AUTO")
+     */
+    protected $id;
+
+    // name
+    /**
+     * @ORM\Column(type="string", length=50)
+     * @Assert\NotBlank()
+     */
+    protected $name;
+
+    // battery
+    /**
+     * @ORM\OneToMany(targetEntity="Battery", mappedBy="size")
+     */
+    protected $batteries;
+
+    public function __construct()
+    {
+        $this->batteries = new ArrayCollection();
+    }
+
+    public function getID()
+    {
+        return $this->id;
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+        return $this;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function addBattery(Battery $battery)
+    {
+        $this->batteries->add($battery);
+        return $this;
+    }
+
+    public function clearBatteries()
+    {
+        $this->batteries->clear();
+        return $this;
+    }
+
+    public function getBatteries()
+    {
+        return $this->batteries;
+    }
+}