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M1550 Lithium Battery Replacement
The internal lithium battery is a technician replaceable item.
Caution: the lithium battery used in this device may present a re or chemical burn hazard if
mistreated. Do not recharge, disassemble, heat above 100°C (212°F) or incinerate. Replace
battery with Panasonic, Part No. BR-2/3A or Micro-Comm Part No. BAT-004-3 only. Use of
another battery may present a risk of re or explosion.
To replace the battery, remove all power to the unit. Caution – power to the relay contacts
may be supplied from other equipment. Un-plug all of the terminal blocks and communica-
tions cables. Un-mount the unit and remove the four screws on the sides of the unit. Place the
unit on a clean working surface and lift the mounting base from the face plate. The battery is
located in the center of the face plate, clipped into the battery holder labeled J15. Use a small
blade screwdriver to pry the battery clip to the side and up. Then pry on the other side to fully
remove the battery clip. At this point the battery is held in place by the battery holder contact
spring force and it is simple to remove the battery with your ngers. Place a new battery in the
battery holder, matching the orientation of the “+” and “-“ markings on the battery to the bat-
tery holder. Replace the battery clip by pressing it into place. Mate the mounting base to the
face plate and re-install the four screws. Re-mount the unit and plug all of the cables back into
the unit.
Dispose of the battery properly. Keep away from children. Do not disassemble and do not
dispose of in re.
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