• Nickel Metal Hydride batteries
• 7AA x 2.7A Hr. with digital temp. sensor
• Size: 3.78" x 3.50" x 0.592"
• Weight: 7.78oz / 220.45g

Temperature range:

• Standard charge 0 to 40C.
• Discharge 0 to 50C.
• Storage < 1month -20 to 50C

Full specifications, user manuals and other supporting information are available here