Abstract: A wearable biometric device includes a biometric sensor system adapted to measure a predetermined physiological property of a user's body at two or more different locations at the body surface and to provide for each such location an associated primary signal indicative of said measured physiological property. The device also includes a detector system adapted to detect a level of coupling of the biometric sensor system with the body at each of the locations and to provide for each of the locations an associated secondary signal indicative of said detected level of coupling and also includes a signal processing unit adapted to generate an output signal indicative of said physiological property as a function of the primary and secondary signals.

Abstract: A wearable biometric device includes a biometric sensor system adapted to measure a predetermined physiological property of a user's body at two or more different locations at the body surface and to provide for each such location an associated primary signal indicative of said measured physiological property. The device also includes a detector system adapted to detect a level of coupling of the biometric sensor system with the body at each of the locations and to provide for each of the locations an associated secondary signal indicative of said detected level of coupling and also includes a signal processing unit adapted to generate an output signal indicative of said physiological property as a function of the primary and secondary signals.

Abstract: An electrolyte-based battery cell, having a positive electrode active material layer formed adjacent to a positive electrode collector, a negative electrode active material layer formed adjacent to a negative electrode collector, a separator which has surfaces facing respective surfaces of said active material layers, an electrolyte kept within the separator, the active material layers and there between, and a conductivity measuring means for measuring an electric conductivity of the electrolyte. Also disclosed are a system, and method, for determining the state of charge of an electrolyte-based battery.