1 bq27426 Gauging Design for Applications With 2-S Li-Ion Battery

The bq27426 gas gauge is designed to operate from a single-cell, lithium-ion or lithium-polymer battery. The applications that benefit from these gas gauges use two or more lithium cells in series where the battery voltage exceeds the single cell gas gauge bq27426 battery voltage measurement capability, which normally is equal to or less than 5 V. This application report describes a low-component-count solution for using the bq27421, bq27426, and bq27441 with 2-S (2 cells in series) battery.