What do you think what is batteries alkaline?
Our electronic definitions web site has answer for that as well:
alkaline (includes Manganese button cells). Manganese Dioxide
Volts per cell
Good at low temp. Discharge voltage foils with usage. Good service for heavy duty high current usage. Lasts 57 times longer than carbon zinc.
High current drain radios shavers electronic photoflash movie and VCR cameras toys tape players clocks R/C models.