The phrase describes a common issue experienced with Texas Instruments TI-84 series graphing calculators where the device fails to replenish its battery power when connected to a power source. For instance, a user might plug the calculator into a wall adapter or computer USB port, yet the battery indicator does not show any increase in charge, and the device may eventually cease to function due to power depletion.
This malfunctioning charging capability significantly impacts the usability of the calculator, which is a standard tool for students in mathematics and science courses. The ability to reliably power the device is critical for completing assignments, taking tests, and participating in classroom activities. The TI-84 series has been a mainstay in education for many years, and charging problems can disrupt the learning process, requiring troubleshooting or replacement.