IDCOL/api/application/models/Modbus_battery_model.php

<?php
if (!defined('BASEPATH'))exit('No direct script access allowed');
include_once(FCPATH . 'application/models/Base_model.php');
class Modbus_battery_model extends Base_model {

    protected $table = 'modbus_battery_cmd';

    public function __construct() {
        parent::__construct();
    }

}

?>