Why do battery operated objects such as flashlights and remote controlled toys do not work if you use less battery than what is required?

Battery-operated objects like flashlights and remote-controlled toys require a specific voltage and current to function properly. If the voltage is lower than required, the device may not receive enough power to operate, resulting in dim lighting or failure to turn on. Insufficient battery power can also lead to erratic performance or damage to the device's components over time. In essence, using less battery than needed prevents the device from reaching its operational thresholds.