User`s manual

Memory cards and batteries Batteries
5 – 10
5.2 Batteries
The specified life of the battery does not depend on the current consumption. Replace the bat-
tery always after this time even if there was no voltage failure during this time (refer to section
10.3.1).
5.2.1 Battery specifications
* Battery Q7BAT is not available in EU countries.
5.2.2 Battery installation
The battery of the Q00JCPU, Q00CPU and Q01CPU is behind the upper front cover of the CPU
module. At all other PLC CPU models of MELSEC System Q mounting of the battery is done
from the bottom side.
When shipping, the battery connector is disconnected, to prevent discharge or short circuit of
the battery during transport and storage.
Connect the battery before start up.
Q6BAT battery installation procedure
Open the CPU module front cover (for basic model QCPU) or the module bottom cover (for other
modules) and confirm that the battery is loaded correctly.
Insert the battery connector into the connector pin on the case. Be sure that the insertion direc-
tion is correct.
At those modules where the battery is mounted from the bottom side, check if the connector is
properly inserted into the respective holder inside the battery case.
Item Q6BAT Q7BAT* Q2MEM-BAT Q3MEM-BAT
Classification Manganese dioxide lithium primary battery
Initial voltage 3.0 V 3.0 V 3.0 V 3.0 V
Capacity 1800 mAh 5000 mAh 48 mAh 550 mAh
Battery life when
stored
5 years (at 20 °C)
Application For data retention of the program memory,
standard RAM, and latch device during
power failure
Power failure backup
for SRAM card
Q2MEM-
Power failure backup
for SRAM card
Q3MEM-
Lithium content 0.49 g 1.52 g 0.014 g 0.15 g
Tab. 5-4: Battery specifications
Fig. 5-10:
Location of battery for Basic model QCPU
CPU module
Connector