That's not too bad! The figures manufacturers give seem to be 'best case' scenarios (i.e. "guaranteed not to exceed"

). That's why they say "up to" I suppose.
DAPreview mention in their test (see
http://dapreview.net/e107_plugins/co...?content.296.9 ) that a Meizu with a firmware version older than 1.009 lasted 14.5 hours in a test similar to yours, Hendrik. So there is a significant improvement with the newer version, of about 38%.
That's a very interesting test you did, by the way! Thanks!