... 2V / singleAAAA size battery2/3AAA, 10*28.4mm, 280~300mah, AAA, 10*44mm, 240~650mah,2/3AA, 13.9*28.5mm ... effect(3)High energy density, wide operating temperature -20~50(4)Flat discharge performance, quick charging capability.(5)No memory effect ... such as electric shavers, electric toothbrushes, massagers, portable vacuum cleaners.(4)Digital cameras, personal digital assistants (PDA), Portable CD/MD/MP3 ...