Abstract: “Undrainable battery power system of interlocking lego-like interconnectable pluggable interchangeable inter-rechargeable batteries as well as connectible to a energizable product (e.g. machine, engines, apparatus, devices, gadgets, widgets and the like)”. The present invention relates to a system of one or more inter-pluggable batteries, each one having one or more settings/projections/stud poles, and; one or more housings and/or frames namely holes and/or encasings, enabling the said batteries to heap up on top of each other and get linked and plugged by fitting into the other rear end hole(s) or housing(s) or encasing(s) of another same referred pluggable battery forming stacks like lego bricks by being tightly-, securely- or loosely-attached, plugged, fastened or adjusted to one another, as well as the said batteries permitting the conduction in series and/or parallel of energy from one battery into the other battery in a pole-into-hole way and into an energizable product (e.g.

Abstract: “Self-playing robot guitar comprising a biodegradable skin-leathern formed carcass and a biodegradable skin-leathern formed musical plectrum, and structured protein/amino acids”. The invention relates to a robot having humanoid activity and extremities, having a carcass comprising a chordophone, in particular a guitar, the body of which is optionally skin-leathern formed. Said robot plays instrumental music on and by itself using its own hands thereof. The components of the invention are optionally made of structured proteins/amino acids. In addition, said components are food for animals and plants.