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An energy storage system includes a reservoir defining an interior chamber, a collapsible bladder positioned within the interior chamber and having working fluid therein, a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air into the interio

An energy storage system includes a reservoir defining an interior chamber, a collapsible bladder positioned within the interior chamber and having working fluid therein, a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air into the interior chamber as working fluid exits the bladder, a reversible pump/motor in fluid communication with the bladder, and an accumulator containing working fluid and gas. The accumulator is in selective fluid communication with the reversible pump/motor to deliver pressurized working fluid to the reversible pump/motor when operating as a motor, and to receive pressurized working fluid discharged by the reversible pump/motor when operating as a pump.

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1. An energy storage system comprising: a reservoir defining an interior chamber;a collapsible bladder positioned within the interior chamber, the bladder having working fluid therein;a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air int

1. An energy storage system comprising: a reservoir defining an interior chamber;a collapsible bladder positioned within the interior chamber, the bladder having working fluid therein;a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air into the interior chamber as working fluid exits the bladder;a reversible pump/motor in fluid communication with the bladder; andan accumulator containing working fluid and gas, the accumulator in selective fluid communication with the reversible pump/motor to deliver pressurized working fluid to the reversible pump/motor when operating as a motor, and to receive pressurized working fluid discharged by the reversible pump/motor when operating as a pump. 2. The energy storage system of claim 1, further comprising a pressure relief valve in fluid communication with the interior chamber of the reservoir and operable to prevent ventilation of the replacement air from the interior chamber below a predetermined threshold pressure when working fluid enters the collapsible bladder. 3. The energy storage system of claim 1, further comprising an air pump in selective fluid communication with the interior chamber of the reservoir and operable to fill the interior chamber with pressurized air to exert a compressive force on the bladder. 4. The energy storage system of claim 1, further comprising a pressure sensor in fluid communication with the interior chamber of the reservoir to detect the air pressure in the interior chamber. 5. The energy storage system of claim 1, wherein the reservoir includes a sump positioned below the bladder. 6. The energy storage system of claim 5, further comprising a sensor operable to detect working fluid in the sump leaked from the bladder. 7. The energy storage system of claim 1, wherein working fluid is drawn from the bladder by the reversible pump/motor when operating as a pump. 8. The energy storage system of claim 1, wherein the bladder defines an interior chamber, and wherein the reversible pump/motor is in fluid communication with the interior chamber of the bladder. 9. The energy storage system of claim 1, wherein the bladder is non-elastic. 10. A method of operating an energy storage system, the method comprising: providing a reservoir defining an interior chamber;positioning a collapsible bladder within the interior chamber;returning working fluid to the collapsible bladder with a reversible pump/motor when operating as a motor;drawing working fluid from the collapsible bladder when the reversible pump/motor is operating as a pump; andpermitting replacement air to enter the interior chamber of the reservoir when working fluid is drawn from the collapsible bladder. 11. The method of claim 10, further comprising preventing ventilation of the replacement air from the interior chamber below a predetermined threshold pressure in the interior chamber when working fluid is returned to the collapsible bladder. 12. The method of claim 10, further comprising filling the interior chamber with pressurized air before working fluid is drawn from the bladder. 13. The method of claim 12, wherein filling the interior chamber with pressurized air occurs before working fluid is returned to the collapsible bladder. 14. The method of claim 10, further comprising monitoring the air pressure in the interior chamber of the reservoir. 15. The method of claim 10, further comprising: providing a sump below the collapsible bladder; andmonitoring the sump for working fluid leaked from the bladder and accumulating in the sump. 16. An energy storage system comprising: a reservoir defining an interior chamber having working fluid therein;a one-way valve in fluid communication with the interior chamber and operable to permit entry of replacement air into the interior chamber as working fluid exits the reservoir;a pressure relief valve in fluid communication with the interior chamber and selectively operable to vent air in the interior chamber outside the reservoir;an air pump in selective fluid communication with the interior chamber and operable to discharge pressurized air into the interior chamber;a reversible pump/motor in fluid communication with the reservoir; andan accumulator containing working fluid and gas, the accumulator in selective fluid communication with the reversible pump/motor to deliver pressurized working fluid to the reversible pump/motor when operating as a motor, and to receive pressurized working fluid discharged by the reversible pump/motor when operating as a pump. 17. The energy storage system of claim 16, further comprising a collapsible bladder positioned within the interior chamber, wherein the working fluid in the reservoir is contained entirely within the bladder. 18. The energy storage system of claim 17, wherein the air pump is operable to fill the interior chamber with pressurized air to exert a compressive force on the bladder. 19. The energy storage system of claim 17, wherein working fluid is drawn from the bladder by the reversible pump/motor when operating as a pump. 20. The energy storage system of claim 17, wherein the bladder is non-elastic.