BBM supplies the Sieko MS421FE-FL26E coin cell battery, delivering 3V/1mAh of power.
Battery Specifications:
Part Number: MS421FE-FL26E
Chemistry: Lithium Manganese Silicon (LiMnSi)
Voltage: 3V
Capacity: 1mAh
Dimensions: 4.8mm diameter x 1.2mm height
Terminals: SMD/SMT tab (Surface Mount)
BIN: ML-33