diff --git a/Classes/PHPExcel/CachedObjectStorage/APC.php b/Classes/PHPExcel/CachedObjectStorage/APC.php
index ea739eaa..8f1e931e 100644
--- a/Classes/PHPExcel/CachedObjectStorage/APC.php
+++ b/Classes/PHPExcel/CachedObjectStorage/APC.php
@@ -60,7 +60,7 @@ class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_Cach
      * @return  void
      * @throws  PHPExcel_Exception
      */
-    private function _storeData() {
+    protected function _storeData() {
         if ($this->_currentCellIsDirty) {
             $this->_currentObject->detach();
 
@@ -162,6 +162,20 @@ class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_Cach
     }    //    function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
     /**
      * Delete a cell in cache identified by coordinate address
      *
diff --git a/Classes/PHPExcel/CachedObjectStorage/CacheBase.php b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
index 822a655a..fb34da02 100644
--- a/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
+++ b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
@@ -232,6 +232,9 @@ abstract class PHPExcel_CachedObjectStorage_CacheBase {
 	 * @return	void
 	 */
 	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		$this->_currentCellIsDirty;
+        $this->_storeData();
+
 		$this->_parent = $parent;
 		if (($this->_currentObject !== NULL) && (is_object($this->_currentObject))) {
 			$this->_currentObject->attach($parent);
diff --git a/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php b/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
index 59f993ac..41bb168e 100644
--- a/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
+++ b/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
@@ -64,7 +64,7 @@ class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -132,6 +132,20 @@ class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clone the cell collection
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
index 3728d678..19aa2673 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
@@ -42,7 +42,7 @@ class PHPExcel_CachedObjectStorage_Igbinary extends PHPExcel_CachedObjectStorage
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -104,6 +104,20 @@ class PHPExcel_CachedObjectStorage_Igbinary extends PHPExcel_CachedObjectStorage
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clear the cell collection and disconnect from our parent
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorage/Memcache.php b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
index a72fa191..2f995a14 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Memcache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
@@ -64,7 +64,7 @@ class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -166,6 +166,20 @@ class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
     /**
      * Delete a cell in cache identified by coordinate address
      *
diff --git a/Classes/PHPExcel/CachedObjectStorage/Memory.php b/Classes/PHPExcel/CachedObjectStorage/Memory.php
index be84c43d..c3efa13b 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Memory.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Memory.php
@@ -35,6 +35,14 @@
  */
 class PHPExcel_CachedObjectStorage_Memory extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
 
+    /**
+     * Dummy method callable from CacheBase, but unused by Memory cache
+     *
+	 * @return	void
+     */
+	protected function _storeData() {
+	}	//	function _storeData()
+
     /**
      * Add or Update a cell in cache identified by coordinate address
      *
diff --git a/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php b/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
index 9ee3aaea..cc602795 100644
--- a/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
+++ b/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
@@ -42,7 +42,7 @@ class PHPExcel_CachedObjectStorage_MemoryGZip extends PHPExcel_CachedObjectStora
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -104,6 +104,20 @@ class PHPExcel_CachedObjectStorage_MemoryGZip extends PHPExcel_CachedObjectStora
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clear the cell collection and disconnect from our parent
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php b/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
index 82dc167b..fbf22577 100644
--- a/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
+++ b/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
@@ -42,7 +42,7 @@ class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjec
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -104,6 +104,20 @@ class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjec
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clear the cell collection and disconnect from our parent
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php b/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
index e5af520b..cc046343 100644
--- a/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
+++ b/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
@@ -56,7 +56,7 @@ class PHPExcel_CachedObjectStorage_PHPTemp extends PHPExcel_CachedObjectStorage_
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -124,6 +124,20 @@ class PHPExcel_CachedObjectStorage_PHPTemp extends PHPExcel_CachedObjectStorage_
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Clone the cell collection
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite.php b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
index 56cc3f9b..05be66e0 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
@@ -56,7 +56,7 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -175,6 +175,10 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 	 * @return	array of string
 	 */
 	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
 		$query = "SELECT id FROM kvp_".$this->_TableName;
 		$cellIdsResult = $this->_DBHandle->unbufferedQuery($query,SQLITE_ASSOC);
 		if ($cellIdsResult === false)
@@ -196,6 +200,9 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 	 * @return	void
 	 */
 	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		$this->_currentCellIsDirty;
+        $this->_storeData();
+
 		//	Get a new id for the new table name
 		$tableName = str_replace('.','_',$this->_getUniqueID());
 		if (!$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
index 3c3cf745..45204c24 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
@@ -56,7 +56,7 @@ class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -179,6 +179,10 @@ class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_
 	 * @return	array of string
 	 */
 	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
 		$query = "SELECT id FROM kvp_".$this->_TableName;
 		$cellIdsResult = $this->_DBHandle->query($query);
 		if ($cellIdsResult === false)
@@ -200,6 +204,9 @@ class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_
 	 * @return	void
 	 */
 	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		$this->_currentCellIsDirty;
+        $this->_storeData();
+
 		//	Get a new id for the new table name
 		$tableName = str_replace('.','_',$this->_getUniqueID());
 		if (!$this->_DBHandle->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
diff --git a/Classes/PHPExcel/CachedObjectStorage/Wincache.php b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
index 30fe7e1f..6065e17a 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Wincache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
@@ -57,7 +57,7 @@ class PHPExcel_CachedObjectStorage_Wincache extends PHPExcel_CachedObjectStorage
 	 * @return	void
      * @throws	Exception
      */
-	private function _storeData() {
+	protected function _storeData() {
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
@@ -166,6 +166,20 @@ class PHPExcel_CachedObjectStorage_Wincache extends PHPExcel_CachedObjectStorage
 	}	//	function getCacheData()
 
 
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return  array of string
+	 */
+	public function getCellList() {
+		if ($this->_currentObjectID !== null) {
+			$this->_storeData();
+		}
+
+		return parent::getCellList();
+	}
+
+
 	/**
 	 * Delete a cell in cache identified by coordinate address
 	 *
diff --git a/Classes/PHPExcel/CachedObjectStorageFactory.php b/Classes/PHPExcel/CachedObjectStorageFactory.php
index 90f0af0c..f68431e3 100644
--- a/Classes/PHPExcel/CachedObjectStorageFactory.php
+++ b/Classes/PHPExcel/CachedObjectStorageFactory.php
@@ -236,4 +236,12 @@ class PHPExcel_CachedObjectStorageFactory
         return FALSE;
     }   //    function getInstance()
 
+
+	public static function finalize()
+	{
+		self::$_cacheStorageMethod = NULL;
+		self::$_cacheStorageClass = NULL;
+		self::$_storageMethodParameters = array();
+	}
+
 }
diff --git a/changelog.txt b/changelog.txt
index 3f0f81c9..5ab739cb 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -42,6 +42,7 @@ Fixed in develop branch:
 - Bugfix:   (alexgann)  Work item GH-63 - Fix to cellExists for non-existent namedRanges
 - Bugfix:   (MBaker)    Work item 18844 - cache_in_memory_gzip "eats" last worksheet line, cache_in_memory doesn't
 - Bugfix:   (Progi1984) Work item GH-22 - Sheet View in Excel5 Writer
+- Bugfix:   (amironov)  Work item GH-82 - PHPExcel_Worksheet::getCellCollection() may not return last cached cell
 
 
 --------------------------------------------------------------------------------
diff --git a/unitTests/Classes/PHPExcel/Worksheet/CellCollectionTest.php b/unitTests/Classes/PHPExcel/Worksheet/CellCollectionTest.php
new file mode 100644
index 00000000..c2c130d7
--- /dev/null
+++ b/unitTests/Classes/PHPExcel/Worksheet/CellCollectionTest.php
@@ -0,0 +1,31 @@
+<?php
+
+class CellCollectionTest extends PHPUnit_Framework_TestCase
+{
+
+	public function setUp()
+	{
+		if (!defined('PHPEXCEL_ROOT'))
+		{
+			define('PHPEXCEL_ROOT', APPLICATION_PATH . '/');
+		}
+		require_once(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
+	}
+
+
+	public function testCacheLastCell()
+	{
+		$methods = PHPExcel_CachedObjectStorageFactory::getCacheStorageMethods();
+		foreach ($methods as $method) {
+			PHPExcel_CachedObjectStorageFactory::initialize($method);
+			$workbook = new PHPExcel();
+			$cells = array('A1', 'A2');
+			$worksheet = $workbook->getActiveSheet();
+			$worksheet->setCellValue('A1', 1);
+			$worksheet->setCellValue('A2', 2);
+			$this->assertEquals($cells, $worksheet->getCellCollection(), "Cache method \"$method\".");
+			PHPExcel_CachedObjectStorageFactory::finalize();
+		}
+	}
+
+}