Hi Eduardo, Do you have a 5V bench supply that you can use to power the ADC + bridge? I'd recommend using the same supply to excite the bridge as well as the ADC, this way you'll know that the common-mode output voltage of the bridge is within range of the ADC. In this configuration you could either route the bridge excitation voltage back to the ADC or just use the internal AVDD-AVSS reference. Floating the battery with respect to the ADC ground certainly will have issues. Connecting it to ground should provide better results, but perhaps this connection is too long and causing issues. Also, do you have any way of knowing if the load cell has any memory to it? If you take a longer data set does the measurement eventually return to the zero set-point?
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