The LC709204FXE-01TBG is a fuel gauge LSI for 1-cell Lithium-ion/Polymer batteries that measures the Relative State Of Charge (RSOC) using its unique HG-CVR2 algorithm. It features a very low operational current of 2 µA and an I2C interface that supports speeds up to 400 kHz. The device provides accurate gauging without a current sensing resistor, eliminates the need for a learning cycle, and enhances safety with alarm functions for voltage, temperature, and RSOC. Housed in a compact WLCSP12 package, this LSI is ideal for power-sensitive and space-constrained applications such as wearables, IoT devices, and smartphones.