Brand/Series : PS Series or Universal

Capacity : 4.5 Ah

Chemical System : Lead Acid

Classification : Rechargeable

Dimensions : 2.76"L×1.86"W×4.25"H

Material, Jacket : Non-Conductive ABS Plastic

Primary Type : Rechargeable

Size : Rectangular

Temperature, Operating : -20 to +50 °C

Temperature, Operating, Maximum : 60 °C

Temperature, Operating, Minimum : -40 °C

Termination : Quick Disconnect: 0.187

Voltage, Nominal : 6 VDC

Voltage, Rating : 6 V

Weight : 1.6 lbs.

http://www.power-sonic.com/images/powersonic/sla_batteries/ps_psg_series/6volt/PS-640.pdf_12_July_9.pdf