Pulse encoder counts are retained by battery backup when the robot power is turned off.

• A. True
• B. False
• C. Only for high-end models
• D. Not guaranteed

Answer: (A)

The main idea is that preserving encoder counts during power loss relies on a battery-backed memory keeping the state intact. Encoder counts are the running total of pulses from the motor encoders, which define position and motion history. If power is cut, volatile storage would lose that information and the system would restart from zero, leading to inaccurate position knowledge. With a battery backup, those counts stay written in non-volatile or battery-backed RAM, so when power comes back the controller resumes from the last known state instead of starting over. This continuity is important for safe, reliable operation and correct odometry after any power interruption. If the backup is healthy, retention is guaranteed; if the backup fails, retention isn’t ensured.