bq27Z746 Impedance Track™ Gas Gauge Texas Instruments bq27Z746 Impedance Track™ Gas Gauge solution is a highly integrated, accurate 1-series cell gas gauge and protection solution. The bq27Z746 device provides a fully integrated pack-based solution with a Flash programmable custom reduced instruction-set CPU (RISC), safety protection, differential battery sensing analog output, and authentication for 1-series cell Li-ion and Li-polymer battery packs.