Hitachi ZAXIS 120-6 class Operator's Manual page 346

Warnings After Use
IMPORTANT: Securely fasten the single battery charger
or the battery charger with the battery pack installed
to the holding bracket with a band attached to the
holding bracket so that the battery charger and/or the
battery pack does not come off the bracket. Failure
to do so may cause the battery pack and/or battery
charger to come off the holding bracket, possibly
resulting in damage to the battery pack and/or battery
charger.
MAINTENANCE
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M1U1-07-061
M1U1-07-062
M1U1-07-063