Disclosed herein is an electrical connector. The electrical connector includes an upper pad, a lower pad, a fastener, and a spring. The upper pad includes a first upper groove, a second upper groove, and an upper hole. The upper hole extends through the upper pad between the first upper groove and the second upper groove. The lower pad includes a first lower groove, a second lower groove, and an elongated hole. The elongated hole extends through the lower pad between the first lower groove and the second lower grove. The fastener extends through the upper hole and the elongated hole. The spring is between the fastener and the lower pad. The spring is configured to bias the upper pad and the lower pad towards each other. The lower pad is configured to be pivotable around the fastener, and relative to the upper pad, at the elongated hole.