>No more Chinese camera accessories for me. Aside from this, I >wonder if I am setting menus too often. Could it be >"operator error" that causes battery drain.
You can set and reset menus and configurations 50 times a day without even nudging the battery life. The third-party grip is the culprit, no doubt. The reason for the power drain is likely to be found in its main connector, which is a common problem with several so-called off brands.