Non-electrical battery based on plastic strings and membranes

A non-electrical battery, comprising:

• a linear surface;
• a plurality of strings disposed in parallel relation on the linear surface, each string comprising a first end and a second end, wherein the first end of each string is attached to the linear surface and each string extends away from the linear surface;
• and
• a mechanical energy device attached to the second end of each string to apply a tension to the strings to increase a potential energy stored by the strings, wherein the amount of tension applied to a string of the plurality of strings extends the string by an amount within the range of 0.75·A to A, where A=ε·l, wherein ε is an elasticity of the string and l is the unstretched length of the string.