POWER SOURCE UNIT

Disclosed is power source unit connected to a vibration measurement device and power source unit with a battery, a cap, and a damping element. The battery has a first electrode of battery is contacted to a first electrical connector; and a second electrode of battery is contacted to a second electrical connector. The cap has a first end and a second end that is opposite to first end; and wherein cap is attached at least partly over portion of battery. The damping element has a third end and a fourth end that is opposite to third end; and a receiving portion that extends from third end to fourth end to define an internal hollow space that accommodates at least partly battery, first electrical connector, second electrical connector, cap.