The lithium battery in the Neato Connected series is now a "smart" battery with an SMbus serial data interface to the robot cpu, with a Texas Instrument battery management IC inside the battery pack. This IC handles everything about the battery including temperature and fuel gauge measurement, and even serial number for authentification so only genuine OEM parts can be used. This is for protection against the fire hazard in lithium batteries requiring quality control in manufacturing. The USB GetVersion command or Neato Control program will show battery information including an authentification flag.
Unusual problems can appear with problems in this smart battery. Posts at http://www.robotreviews.com/chat/viewtopic.php?f=20&t=22430