Two suitcase-sized batteries would be somewhat inconvenient for day-to-day use, too.
For instance, if you request a file that doesn't exist, a 404 Not Found is issued and the corresponding ErrorDocument is served with the 404 Not Found Header.
You can tune a piano, but you can't tuna fish. You can tune a filesystem, but you can't tuna fish. -- from the tunefs(8) man page