Delete SharePoint list items using Powershell

[System.Reflection.Assembly]::Load("Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")
[System.Reflection.Assembly]::Load("Microsoft.SharePoint.Portal, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")
[System.Reflection.Assembly]::Load("Microsoft.SharePoint.Publishing, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")
[System.Reflection.Assembly]::Load("System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")

write-host

# Enter your configuration here
$siteUrl = "http://q.documanager.hot.tognum.com"
$listName = "SAP MRP Type"
$batchSize = 10

write-host "Opening web at $siteUrl..."

$site = new-object Microsoft.SharePoint.SPSite($siteUrl)
$web = $site.OpenWeb()
write-host "Web is: $($web.Title)"

$list = $web.Lists[$listName];
write-host "List is: $($list.Title)"

while ($list.ItemCount -gt 0)
{
  write-host "Item count: $($list.ItemCount)"

  $batch = "<?xml version=`"1.0`" encoding=`"UTF-8`"?><Batch>"
  $i = 0

  foreach ($item in $list.Items)
  {
    $i++
    write-host "`rProcessing ID: $($item.ID) ($i of $batchSize)" -nonewline

    $batch += "<Method><SetList Scope=`"Request`">$($list.ID)</SetList><SetVar Name=`"ID`">$($item.ID)</SetVar><SetVar Name=`"Cmd`">Delete</SetVar><SetVar Name=`"owsfileref`">$($item.File.ServerRelativeUrl)</SetVar></Method>"

    if ($i -ge $batchSize) { break }
  }

  $batch += "</Batch>"

  write-host

  write-host "Sending batch..."

  # We execute it
  $result = $web.ProcessBatchData($batch)

  write-host "Emptying Recycle Bin..."

  # We remove items from recyclebin
  $web.RecycleBin.DeleteAll()

  write-host

  $list.Update()
}

write-host "Done."