Abstract: A method for controlling a charge to a battery pack via a battery management system (BMS) integrated circuit (IC) includes monitoring one or more parameters associated with the battery pack. The method also includes monitoring a charge output from a direct current (DC)-DC converter to the battery pack. The method further includes adjusting feedback to the DC-DC converter in accordance with monitoring the one or more parameters and monitoring the charge output, the feedback being a local feedback to the DC-DC converter or a reference input to the DC-DC converter.

Abstract: Disclosed are stereo sound system devices and methods for reproducing stereo sound with improved auditory experience and reduced speaker rattle. In some embodiments, the disclosed arrangement of speakers on the sound system housing and driving low frequency speakers with the same signal contribute to the improved auditory experience and reduced speaker rattle effect.

Abstract: Disclosed are stereo sound system devices and methods for reproducing stereo sound with improved auditory experience and reduced speaker rattle. In some embodiments, the disclosed arrangement of speakers on the sound system housing and driving low frequency speakers with the same signal contribute to the improved auditory experience and reduced speaker rattle effect.

Abstract: Disclosed are portable energy storage devices and methods for fast charging them using non-isolated power supplies, while maintaining device and user safety. Techniques are disclosed to reduce the size of power supplies needed to charge portable energy storage devices and reduce the charge time of these devices.