Dell OptiPlex 990 Technical Guide - Page 22
Dell™ Optiplex™ 990
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DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 POWER NOTE: These form factors utilize a more efficient Active Power Factor Correction (APFC) power supply. Dell recommends only Universal Power Supplies (UPS) based on Sine Wave output for APFC PSUs, not an approximation of a Sine Wave, Square Wave, or quasi-Square Wave. If you have questions, please contact the manufacture to confirm the output type. 3.0v CMOS battery (Type and estimated battery life) Brand Type Voltage Composition PANASONIC CR-2302L/ 3V BE Lithium MITSUBISHI CR2302 3V Lithium Life Continuous Discharge Under 15 kΩ Load to 2.5V EndVoltage. 20℃ ±2℃ .1183Hrs. or Longer.1133Hrs.or Longer after 12 months. Continuous Discharge Under 15 kΩ Load to 2.0V EndVoltage. 20℃ ±2℃ .1000Hrs. or Longer.970Hrs.or Longer after 12 months. 0℃±2℃. 910Hrs. or Longer.890Hrs.or Longer after 12 months. 22