Hydraulic accumulator
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A hydraulic accumulator is an energy storage device. It is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure from an external source. That external source can be a spring, a raised weight, or a compressed gas.
Compressed gas accumulators are by far the most common type. These are also called hydropneumatic accumulators.
External links
What's An Accumulator? (http://www.tobul.com/bkgd/whats.html)
Hydraulic Accumulator (http://www.hydraulic-equipment-manufacturers.com/hydraulic-accumulator.html) - Detailed discussion of various types.