A method of controlling an energy storage system, wherein the energy storage system includes a first energy storage device and a second energy storage device and wherein the second energy storage device has a different chemical composition for storing energy than the first energy storage device, the method comprising: identifying a change in power demand from the energy storage system with a first regulator, wherein the first regulator is operatively connected between the first energy storage device and a common connection point of the energy storage system; identifying the change in power demand from the energy storage system with a second regulator, wherein the second regulator is operatively connected between the second energy storage device and the common connection point of the energy storage system; transferring energy between the common connection point of the energy storage system and the first energy storage device via the first regulator responsive to initially identifying the change in power demand; preventing energy transfer between the common connection point of the energy storage system and the second energy storage device via the second regulator responsive to initially identifying the change in power demand; when the change in power demand continues for a first duration, decreasing the energy transferred between the common connection point of the energy storage system and the first energy storage device via the first regulator over a second duration; when the change in power demand continues for the first duration, increasing the energy transferred between the common connection point of the energy storage system and the second energy storage device via the second regulator over the second duration; when the change in power demand continues beyond the second duration, preventing energy transfer between the common connection point of the energy storage system and the first energy storage device via the first regulator; and when the change in power demand continues beyond the second duration, transferring energy between the common connection point of the energy storage system and the second energy storage device via the second regulator. identifying a change in power demand from the energy storage system with a first regulator, wherein the first regulator is operatively connected between the first energy storage device and a common connection point of the energy storage system; identifying the change in power demand from the energy storage system with a second regulator, wherein the second regulator is operatively connected between the second energy storage device and the common connection point of the energy storage system; transferring energy between the common connection point of the energy storage system and the first energy storage device via the first regulator responsive to initially identifying the change in power demand; preventing energy transfer between the common connection point of the energy storage system and the second energy storage device via the second regulator responsive to initially identifying the change in power demand; when the change in power demand continues for a first duration, decreasing the energy transferred between the common connection point of the energy storage system and the first energy storage device via the first regulator over a second duration; when the change in power demand continues for the first duration, increasing the energy transferred between the common connection point of the energy storage system and the second energy storage device via the second regulator over the second duration; when the change in power demand continues beyond the second duration, preventing energy transfer between the common connection point of the energy storage system and the first energy storage device via the first regulator; and when the change in power demand continues beyond the second duration, transferring energy between the common connection point of the energy storage system and the second energy storage device via the second regulator.