Casio BG-178DM / BG-153 Manual — Module 2285

Two owner's manual PDFs for the Casio module 2285, each a different scan (English included). Casio fitted it in the BG-178DM and BG-153. Casio's spec sheet lists one CR1616, with 24 months of battery life and accuracy within ±15 seconds a month; the module first shipped in Jan 2001.