Thin film battery on an integrated circuit or circuit board and method thereof

An integrated circuit including a battery, comprising: a semiconductor device (105) or a flexible printed circuit board (305) having a surface; a bonding layer (110; 310) coupled with the surface of the semiconductor device or the flexible printed circuit board, the bonding layer comprising an embedded conductor (120; 320); a battery cell structure (115; 315) in selective electrical contact with the surface via the embedded conductor; and a first electrical contact (101; 301) coupled with the battery cell structure, wherein the bonding layer and the battery cell structure are sandwiched between the surface and the first electrical contact.