Flexible subcutaneous implantable medical device (IMD), including an elongated and flexible body (256), a plurality of electronic components, at least one rechargeable battery (426), at least one antenna (260, 422), at least one lead (254) and at least one transition unit (252), the antenna for receiving and transmitting electromagnetic radiation and the lead for providing an electric shock, wherein the elongated and flexible body is structured from a plurality of units, wherein a first one of the plurality of units encapsulates the rechargeable battery, wherein each one of the other plurality of units respectively encapsulates a respective one of the plurality of electronic components, wherein the antenna is positioned in the transition unit, wherein the transition unit is covered with a biocompatible polymer, wherein the antenna receives electromagnetic radiation for recharging the rechargeable battery and wherein the antenna includes a copper coil having a generally cylindrical shape.