A thin battery (100) has a central portion (110) and two end portions (120). One of the two end portions includes a positive voltage connection (121) exposed on both the top and bottom surfaces of the battery. The other one of the two end portions includes a negative voltage connection (122) exposed on both the top and bottom surfaces of the battery. Each of the end portions (120) includes a magnetic element having a north magnetic pole on one of the top or bottom surface of the battery and a south magnetic pole on the other one of the top or bottom surface of the battery. Multiple batteries may be connected to each other through magnetic attraction. The battery may be securely attached and electrically connected to a garment (1000) using positive and negative conductive surfaces/contacts (1010, 1020) on a fiber layer of the garment and a corresponding magnetic element (1050) beneath the conductive surfaces/contacts that attracts and secures the battery in place.