PowerWalker VFD 600 APFC - Manual (Page 9)

9. DC Start Function
DC Start Function enables UPS to be started up when AC utility power is
not available and battery is fully charged. Just simply press the power
switch to turn on the UPS.
10. Battery Replacement
CAUTION:
Battery replacement should be performed by qualified service
personnel. Please follow the charts below to replace the batteries.
Step 1: Please prize up the battery cover gently.
Chart 1
Step 2: Please remove the battery cover gently.
Chart 2