2/3 AA Size Lithium Manganese Dioxide Cylindrical Cell
High energy, high reliability 3.0 volt power source.
Excellent memory backup power source.
Low self discharge rate gives this cell a 10 year shelf life.
Stable voltage and broad temperature range (-30° to +75°C).
This is the exact same battery that came with my Dave computer originally. That was what I was looking for and it does the job 100% I highly recommend it