NOVELTY - The method involves forming an electrical insulation layer (14) and/or sealing layer (15) on totality of lateral sides, and on a face including current collectors (12a, 12b) of a microbattery i.e. lithium microbattery. The current collectors of the microbattery are made available. A discontinuous metal layer (16a) is formed such that the metal layer extends from the current collectors to the lateral sides from the microbattery. The electrical insulation and/or sealing layer are allowed to provide the function sealing and include a chemically inert polymer.    USE - Method for encapsulation of a microbattery (claimed) i.e. lithium microbattery.    ADVANTAGE - The metal layer is formed such that the metal layer extends from the current collectors to the lateral sides from the microbattery, thus ensuring robust encapsulation of the microbattery, while ensuring compatibility with back end of line (BEOL) technology, while allowing easy electric connection with individual elements such as transistors and resistors. The insulation layer and/or sealing layer improve performance of the microbattery, and the lithium layer is protected from air. The method allows a batch of micro batteries to be easily manufactured. The method allows the battery to be highly powerful and to be completely hermetic with respect to oxidizing agents. The method allows good electric insulation of the active elements of the microbattery, thus avoiding short-circuits. The method ensures a good sealing of the microbattery with respect to the aggressions resulting from the steam and oxidizing agents. The method ensures robustness of the sides of the assembled microbatteries, thus allowing the stacking of a consequent number of micro batteries.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for vertical assembly of encapsulated micro batteries unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a vertical sectional view of a microbattery unit that is covered by a metal layer on totality with current collectors, on part of upper face, and on totality of lateral sides.    Current collectors (12a, 12b)    Active elements (13)    Electrical insulation layer (14)    Sealing layer (15)    Discontinuous metal layer (16a)