9.4BATTERY NG Lamp
If battery capacity became less than operating limit value or there was connection mistake, the "BATTERY NG" lamp on the rear side of the STP control unit front panel (See 9.3, "Life of the Internal Battery)", the "FAILURE" lamp, and the "EMERGENCY OPERATION" lamp on the STP control unit front panel light, and the STP pump does not start.
Replace the battery with a new one and reset the "Battery Capacity Low Warning" (BATTERY NG) lamp.
However, when capacity of battery is less than operating limit value largely, there may be the thing that battery abnormal detection does not operate.
For instructions on how to replace the battery and restart the STP pump, see 9.5 “How to Replace the Internal Battery "
CAUTION 
◇When the " BATTERY NG" lamp lights, always replace the internal battery with a new one.
◇"BATTERY NG" lamp does not indicate the battery exchange time beforehand. There is the case that battery deteriorates even if this lamp does not turn on. According to 9.1 "Life of the internal Battery", change battery regularly.
NOTICE
◇When the power is turned on again, the "FAILURE" lamp goes out.
