A CMOS battery--short for complementary metal oxide semiconductor--is necessary to retain your computer's hardware settings. Symptoms of a dying CMOS battery include system warnings, lost time settings, and sometimes even unexpected shutdowns. Once you've recognized the symptoms, you can check the battery itself.
A non-governmental organization (NGO) is a citizen-based association that operates independently of government, usually to deliver resources or serve some social or political purpose.
A nonprofit organization exists to provide a particular service to the community. The word nonprofit refers to a type of business -- one which is organized under rules that forbid the distribution of profits to owners. Profit in this context is a relatively technical accounting term, related to but not identical with the notion of a surplus of revenues over expenditures.