Abstract: A motor drive unit for a system for raising and lowering a covering material (e.g., a window treatment system) may be configured to execute a test procedure for determining if the system is spring-balanced properly. The motor drive unit may be powered from at least one battery. The system may comprise one or more lift assistance springs configured to provide variable lift assistance to the motor drive unit for raising and lowering the covering material. During the test procedure, the motor drive unit may be configured to control the covering material between a lowered position and a raised position and determine a magnitude of an input power of the motor drive unit during the movement. The motor drive unit may determine that the system requires more or less lift assistance springs based on the input power, and communicate an indication that the system requires more or less lift assistance springs.