NOVELTY - Bio-nano power cell (BNPC) (I), is new.    USE - The BNPC is useful: for diagnosing or treating a disease in an animal; for monitoring the level of an analyte; and in agricultural formulation (all claimed), where the disease is cancer, autoimmune disease, genetic defects, central nervous system disorders, infectious diseases and cardiac disorders. The BNPC is also useful e.g.: for localized power generation in therapeutic, carried material (C1M1) delivery applications; as redox mediators in electrochemical sensors for the detection of analytes in bio-fluids; as fuel cell; for energy storage; and in electrical devices e.g. pacemaker and nerve growth stimulator. No biological data given.    ADVANTAGE - The bio-nano power cell: is biocompatible and does not require separate membrane layer or other layer; is resistant to biological fouling i.e. anti-biofouling; is capable of producing flash, intermittent or continuous power by electrolyzing compounds in biological systems; exhibits redox potentials in a particular range, the ability to exchange electrons rapidly with electrodes, i.e. the ability to rapidly transfer electrons to or rapidly accept electrons from an enzyme to accelerate the kinetics of electro-oxidation or electro-reduction; enables accurate, reproducible and quick or continuous assays; is highly stable under ambient light and at the temperatures encountered in use, storage and transportation; facilitates on-demand carried material (C1M1) delivery; is capable of releasing the therapeutic on-demand at the targeted sites, thus reducing the need for systemic cancer treatments.    DETAILED DESCRIPTION - Bio-nano power cell (BNPC) of formula ((M1)-((L1-R1S1) z-(Q1) f-((D1P1) b-(C1M1) x) z-(Q1) f-(P1B1) c-(S1F1) yt)) (I) or ((M1) k-((L1-R1S1) z-(Q1) f-((D1P1) b-(C1M1) x) z-(Q1) f-(P1B1) c-(S1F1) yt)) (II), is new.    (M1)=iron, cobalt, ruthenium, osmium or vanadium ion;    k=2;    (L1-R1S1)=ligand or groups of ligands, including monodentate, bidentate and tridentate ligands of formula (M1(L1)(L2)(L3)(L4)(L5)-L6) (IA);    L1-L6=(L1) which is same different ligand that is bound or associated with the metal (M1) and is any organic or inorganic moiety that can associate with (M1);    z=0-6;    (Q1)=linker moiety having at least 2 reactive sites;    f=0 or 1 to the number of (R1S1);    (D1P1)=dendritic polymer having the ability to react with (R1S1) and the number of generations, G1, of (D1P1), counting as concentric branch cell shells outward from the core (transition metal complex (TMC)) and usually counting sequentially from the core;    G=1.0 to the de Gennes dense packing of the surface or N-SIS effects, where the surface groups on the (D1P1) are biocompatible or can react with biocompatible surface groups;    b=1 to at least the number of (L1-R1S1) present;    (C1M1)=carried material;    x=0-4000;    (P1B1)=polymer backbone;    c, t=1-6;    (S1F1)=surface functionality groups that can either react with or associate with an enzyme, analyte, biocompatible group, crosslinking group, or (C1M1), or be inert; and    y=1 to the total number of possible surface groups available, and if greater than 1 may be the same or different moiety.    Provided that: at least one (L1) have at its end terminus a reactive site (R1S1); when t is less than 6, the other available sites on (M1) are (L1), H, F, Cl, Br, I, CN, SCN, OH, H 2O, NH 3, alkylamine, dialkylamine, trialkylamine, alkoxy, heterocyclic compounds or polymer backbones that do not have reactive sites; and at least one entity where t is greater than or equal to 1, all z are at least 1.