diff --git a/src/Command/GenerateBatteryCompatibilityCommand.php b/src/Command/GenerateBatteryCompatibilityCommand.php
new file mode 100644
index 00000000..57e20076
--- /dev/null
+++ b/src/Command/GenerateBatteryCompatibilityCommand.php
@@ -0,0 +1,104 @@
+<?php
+
+namespace App\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+use Doctrine\Common\Persistence\ObjectManager;
+
+use App\Entity\VehicleManufacturer;
+use App\Entity\Vehicle;
+use App\Entity\Battery;
+use App\Entity\BatteryManufacturer;
+use App\Entity\BatteryModel;
+use App\Entity\BatterySize;
+
+class GenerateBatteryCompatibilityCommand extends Command
+{
+    protected $em;
+    protected $vmfg_index;
+
+    public function __construct(ObjectManager $om)
+    {
+        $this->em = $om;
+
+        parent::__construct();
+    }
+
+    protected function populateVehicleManufacturerIndex()
+    {
+        $vms = $this->em->getRepository(VehicleManufacturer::class)->findAll();
+
+        $this->vmfg_index = [];
+        foreach ($vms as $vm)
+        {
+            $mfg_name = $vm->getName();
+            // $this->vmfg_index[$mfg_name] = [];
+
+            // get vehicles from manufacturer
+            $make_array = [];
+            $vehicles = $vm->getVehicles();
+            foreach ($vehicles as $vehicle)
+            {
+                $batteries = $vehicle->getBatteries();
+                $comp_batt = [];
+                foreach ($batteries as $battery)
+                {
+                    // set to the first compatible battery found until a more expensive one is found
+                    $comp_batt['id'] = $battery->getID();
+                    $comp_batt['name'] = $battery->getModel()->getName() . ' ' . 
+                                $battery->getSize()->getName();
+                    $comp_batt['image_url'] = '/assets/img/products/' . strtolower($battery->getModel()->getName()) . '.png';
+                    $comp_batt['description'] = '';
+                    //$comp_batt['description'] = $battery->getDescription();
+
+                    // store the selling price for comparison
+                    $batt_price = $battery->getSellingPrice();
+  
+                    // find the most expensive compatible battery
+                    if ($battery->getSellingPrice() > $batt_price)
+                    {
+                        $comp_batt['id'] = $battery->getID();
+                        $comp_batt['name'] = $battery->getModel()->getName() . ' ' .
+                                $battery->getSize()->getName();
+                        $comp_batt['image_url'] = $battery->getImageFile();
+                        //$comp_batt['description'] = $battery->getDescription();
+                    }
+                }
+
+                // check if no compatible batteries
+                if (!empty($comp_batt))
+                    $make_array[$vehicle->getMake()][$vehicle->getModelYearFormatted()] = $comp_batt;
+                
+            }
+
+            // check if empty
+            if (!empty($make_array))
+                $this->vmfg_index[$mfg_name] = $make_array;
+            
+
+        }
+    }
+
+    protected function configure()
+    {
+        $this->setName('battery:generate_compatibility_json')
+            ->setDescription('Generate a json file containing the vehicles and their compatible batteries')
+            ->setHelp('Generate a json file containing the vehicles and their compatible batteries')
+            ->addArgument('file', InputArgument::REQUIRED, 'Path and name for JSON file.');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $filename = $input->getArgument('file');
+        $this->populateVehicleManufacturerIndex();
+
+        $json_file = fopen($filename, 'w');
+        fwrite($json_file, json_encode($this->vmfg_index, JSON_PRETTY_PRINT));
+        fclose($json_file);
+
+    }
+}