C8 Maintenance    11. Replacing the Battery Unit 
 
C Series Maintenance Manual Rev.2  391 
11. Replacing the Battery Unit 
 
 
WARNING 
■ 
Do not connect or disconnect the motor connectors while the power to the robot 
system is turned ON.  Connecting or disconnecting the motor connectors 
with 
the power ON is extremely hazardous and may result 
in serious bodily injury as 
ve abnormally, and also may result in electric  shock 
and/or malfunction of the robot system.
 
to the robot system, disconnect the power plug from the power 
source.    Be sure to connect the AC power cable to a power receptacle.
 
DO NOT connect it directly to a factory power source.
 
performing  any replacement procedure,  turn OFF the  Controller  and 
 and then disconnect the power plug from the power source. 
Performing any replacement procedure with the power ON is extremely hazardous 
and may result in
 electric shock and/or malfunction of the robot system. 
 
 
WARNING 
■ 
Take meticulous care when handling the lithium battery.
    Improper handling of 
the lithium battery as mentioned below is extremely hazardous and may result in 
heat generation, leakage, explosion, or inflammation.
 
It also may cause serious safety p
roblems. 
 
Attempting to charge 
Disassembling 
Connecting batteries improperly 
Exposing to fire 
Forcing discharge 
Deforming by pressure 
Short-circuit (Polarity; Positive/Negative) 
Heating (85 °C or more) 
Soldering the terminal of the lithium battery 
directly 
When disposing the battery, consult with the professional disposal services or 
comply with the local regulation. 
  Make sure that the battery terminal is insulated, 
even for a used buttery. If the terminal contacts with the 
other metals, it may short 
and result in heat generation, leakage, explosion, or inflammation.
 
 
In case of the low lithium battery power, the error to warn the voltage reduction occurs at 
the Controller startup (the software startup).    All position data will be lost and you will 
need to calibrate all joints. 
The life span of the lithium battery varies depending on the energizing hours and 
installation environment of the Controller.    It is about 3 years as a rough guide (when the 
Controller is connected to power for 8 hours a day).    When the Controller is not 
connected to power, the battery consumption will significantly increase compared to when 
the Controller is energized.    If warnings of voltage reduction occur, replace the lithium 
metal battery even if it has not reached the above product life. 
For the EPSON RC+ 7.0 Ver. 7.2.x or later (firmware Ver.7.2.x.x or later), the 
recommended replacement time for the battery can be checked in the [Maintenance] dialog 
box of the EPSON RC+ 7.0. 
For details, refer to the following manual.   
 RC700 Series Maintenance Manual 6. Alarm