PowerWalker VFI 10000TCP 3_1 - Manual (Page 62)

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3) Remove the battery pack from the cabinet. See Fig. 8-3.
Fig. 8-3 Easy for Battery Replacement -Step 3
4) Replace the old battery packs with the new ones.
5) Reconnect the DC cables.
Note: The battery pack is 20kg weight, be careful not to fall off when
you operate the battery replacement.
If you want to replace batteries without powering down the UPS, you
need to set the UPS work in Bypass Mode. That is to remove the
maintenance switch cover plate of UPS and set the maintenance switch
from “UPS” to “BPS”, turn the M1/M2/N input breaker in the “OFF”
position(you need open the N breaker’s cover at first), and then you can
replace it.