A mechanical circulatory support system comprising: an implantable blood pump; an implantable power supply configured to electrically power the implantable blood pump, the implantable power supply comprising: a first power pathway to the implantable blood pump; a second power pathway to the implantable blood pump, wherein the second power pathway is redundant to the first power pathway; a first energy storage component; a second energy storage component, wherein the first and second energy storage components (802, 804) are arranged in series; an input bus configured to have a first voltage; a voltage converter coupled to the input bus and configured to output a second voltage to the implantable blood pump; a power source configured to receive electrical power from the non-implantable charger and provide power to the input bus; a third power pathway connecting the second energy storage component to the implantable blood pump, wherein the third power pathway is redundant to the first and second power pathways (850, 852), wherein the third power pathway excludes the input bus and the voltage converter; and a non-implantable charger configured to supply electrical power to the implantable power supply via transcutaneous energy transfer, and wherein the first power pathway connects the power source to the implantable blood pump via the input bus and the voltage converter, and wherein the second power pathway connects the first energy storage component to the implantable blood pump via the input bus and the voltage converter. an implantable blood pump; an implantable power supply configured to electrically power the implantable blood pump, the implantable power supply comprising: a first power pathway to the implantable blood pump; a second power pathway to the implantable blood pump, wherein the second power pathway is redundant to the first power pathway; a first energy storage component; a second energy storage component, wherein the first and second energy storage components (802, 804) are arranged in series; an input bus configured to have a first voltage; a voltage converter coupled to the input bus and configured to output a second voltage to the implantable blood pump; a power source configured to receive electrical power from the non-implantable charger and provide power to the input bus; a third power pathway connecting the second energy storage component to the implantable blood pump, wherein the third power pathway is redundant to the first and second power pathways (850, 852), wherein the third power pathway excludes the input bus and the voltage converter; and a first power pathway to the implantable blood pump; a second power pathway to the implantable blood pump, wherein the second power pathway is redundant to the first power pathway; a first energy storage component; a second energy storage component, wherein the first and second energy storage components (802, 804) are arranged in series; an input bus configured to have a first voltage; a voltage converter coupled to the input bus and configured to output a second voltage to the implantable blood pump; a power source configured to receive electrical power from the non-implantable charger and provide power to the input bus; a third power pathway connecting the second energy storage component to the implantable blood pump, wherein the third power pathway is redundant to the first and second power pathways (850, 852), wherein the third power pathway excludes the input bus and the voltage converter; and a non-implantable charger configured to supply electrical power to the implantable power supply via transcutaneous energy transfer, and wherein the first power pathway connects the power source to the implantable blood pump via the input bus and the voltage converter, and wherein the second power pathway connects the first energy storage component to the implantable blood pump via the input bus and the voltage converter.