As shipped from the Texas Instruments factory, the BQ27427 fuel gauge comes with three preprogrammed chemistry profiles and gauging parameters in ROM. Upon device reset, the contents of ROM are copied to associated volatile RAM-based data memory blocks. For proper operation, all parameters in RAM-based data memory require initialization. This can be done by updating data memory parameters in a lab/evaluation situation or by downloading the parameters from a host. The BQ27427 Technical Reference Manual shows the default and typically expected values appropriate for most applications.