KYORITSU 3127 - Manual (Page 53)

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(3) Pull up the battery as below and disconnect the red and black cables. (Pull the
positive and negative connectors upwards and disconnect them from the battery.)
(4) Replace the old battery with the new one (lead-storage battery PXL-12050:
12V5Ah). Ensure that the connectors are properly attached and the metal
terminals of battery are not deformed, and then install the battery observing
the correct polarities.
(5) Slide and attach the battery compartment cover and tighten it with screw.
Ensure that the arrow mark on the battery compartment cover matches with
the“CLOSE”mark on the instrument case.
Pull the connector upwards.