Various examples relate to techniques for monitoring the reliability of a cell impedance measurement of a battery cell. In one example, a device (125) includes a first connection point configured to inject an AC excitation current into a battery cell and into a shunt resistor coupled in parallel with the battery cell (200). The device also includes a second connection point that is designed to inject an AC test current into the shunt resistor. The device also includes analog-to-digital converters configured to generate a cell voltage across the battery cell associated with the AC excitation current, a shunt voltage across the shunt resistor associated with the AC excitation current, and Measure the shunt voltage across the shunt resistor associated with the AC test current.
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