From VapexTech we have the CR123A 3V 1600mAh Lithium Batterys. These are suitable for many Airsoft Applications such as Torches and Sights.
Battery Technology: Lithium (Single Use)
Capacity: 1600 mAh (to 2.0 volts) (rated at 100 ohms at 21°C)
Max Discharge: 1500 mA continuous
Diameter: 17mm
Height: 34.5mm
Voltage: 3V
Weight: 18g
Replaces: 123, 123A, BR2/3A, CR123, CR123A, CR123R, CR17335, CR17345, DL123A, EL123AP, K123LA, L123A, PL123