We are campers and of course needed the comforts of home in having inflatable mattresses.  We bought this pump to replace the first one we bought ten years ago because the battery would not charge any more.  After each use, I always fully charge the pump before storing it.  We often leave it stored for about 6 months before using it again.  It is sturdy and the reverse airflow is handy for deflating mattresses as flat as possible.