Xtreme Power Conversion P80g User & Installation Manual page 13

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P80g User's Manual Uninterruptible Power Supply
Step 3: Pull out the battery box by removing two screws on the front panel.
Step 4: Remove the top cover of battery box and replace the inside batteries.
Step 5: After replacing the batteries, put the battery box back to original location and screw it tightly.
Xtreme Power Conversion Corporation Page 13