Systems and Methods for a Charger with a Real Time Clock

A power tool battery charger for determining time information for use in controlling charging of a power tool battery pack may include a battery pack interface, a controller and a memory. The battery pack interface is configured to receive a power tool battery pack and provide charging current to the power tool battery pack. In some embodiments, the power tool battery charger also includes an input configured to receive a set of data. The controller may be coupled to the input and configured to analyze the set of data to determine time information. In some embodiments, the power tool battery charger includes at least one sensor configured to generate a set of data. The controller may be coupled to the at least one sensor and configured to analyze the set of data to determine time information. The memory is coupled to the controller and configured to store the time information.