The present invention provides a strap having a flexible battery which comprises: a flexible strap body unit in which an installation region is formed; a flexible auxiliary battery module unit mounted on the installation region; and a flexible cover unit installed on an upper part of the strap body unit to cover the auxiliary battery module unit. In addition, the present invention provides a detachable auxiliary power strap connection structure and a smart watch having the same.;COPYRIGHT KIPO 2018
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