The present directed to a cordless power tool system including a plurality of cordless power tools, a plurality of fixed voltage and multi-voltage battery packs and a plurality of battery pack chargers. The battery packs include circuitry to indicate various parameters about the battery pack and communicate this indication to the power tools in order to enable the power tools to alter their motor output schemes to improve performance. The indication may include whether the battery pack is a fixed voltage battery pack or a multi-voltage battery pack and when the multi-voltage battery pack is in a first configuration or a second configuration.