In one embodiment of the invention, an attachment apparatus (100) for attaching a first device to a second device includes a cradle (110) and a suction cup (120) removably attached to the cradle. As an example, the first device can be a battery pack (400) for an electronic device. The cradle includes a major surface (111), a first sidewall (112) coupled to the major surface, a second sidewall (113) coupled to the major surface opposite the first sidewall, and a hole (114) in the major surface. The suction cup is attached to the cradle at the hole.