Hitachi CMU Series User Manual page 10

(chapter 3, page 3-7)
The battery cable must always be wired in a power-on state, so be sure to
provide protection against electric shock before you turn on the power to the
CMU module.
(chapter 6, page 6-2)
Before replacing the module, switch it off to avoid electrical shock hazards and
also to prevent it from being damaged or malfunctioning. (When replacing the
battery module, be sure to follow the procedure described under "6.3 Replacing
the Battery Module.")
(chapter 6, page 6-47)
The battery cable has to be wired in a power-on condition, so be sure to provide
protection against electric shock before you turn on the power to the CMU
module.
(chapter 6, page 6-48)
Handling batteries incorrectly will invite the danger of firing or bursting. Some of
used batteries may have a considerable remaining capacity. Observe the
general cautions for piling-up, packing, and transportation to forward used
batteries to the specialist company of waste disposal safely. Regarding
concrete packing and transportation methods, make previous arrangements
thoroughly with the person in charge of this specialist company.
CAUTION
CAUTION
CAUTION
CAUTION
S-7