SLUAA45 April 2020 BQ27Z561
Texas Instruments has a database of thousands of battery models, as shown in Figure 3. Each model has a unique number referred to as the chemistry identifier, or ‘ChemID’. It is important that the ChemID programmed into the gauge was either generated by TI for that battery or a close match to an existing ChemID in TI database using our online tool - GPCCHEM. The ChemID identification requires running a relax-discharge-relax test while logging data using the gauge’s GUI (bqStudio) and then using GPCCHEM tool with the logged data to identify a close match. If there is no match (model error > 3%), then the cells have to be sent to TI for characterization and ChemID generation. Contact a local field applications engineer if cells have to be sent to TI.