BBM supplies the primary lithium (non rechargeable) ER14250 Battery. Delivering 3.6V/1200mAh of power, this 1/2AA battery will keep you powered.
ER-14250 Battery Specifications:
Battery Type: Cylindrical Cell
Voltage: 3.6 V
Chemistry: Lithium Thionyl Chloride (Non Rechargeable)
Terminal Type: Button Top
Length: 25.15 mm (0.57")
Diameter: 14.55 mm (0.99")