A computer memory saver is a small battery powered electronic device which can be plugged into a vehicles cigarette lighter before disconnecting the vehicles main battery in order to keep a small electric current providing electricity to various components like security coded stereos, clocks and computerised engine management systems.

The benefit of using a computer memory saver is that these systems will not reset to original settings because of the lack of power. Sometimes if these components do reset they require recalibration or extra work to restore them to the correct settings.