ARK’s Vibes were specifically engineered with portability in mind, hence their compact and lightweight design. In order for the handle to have such a slim diameter, the Vibes come with a special battery not sold in stores. Buy a spare!
Please note: the batteries sold with these units have very little rust protection. Effective rust inhibitors are usually not safe, and so these batteries do not have these hazardous coatings. This means, however, that they are more susceptible to water and/or moisture. Please use extra caution. If you suspect that any water and/or moisture has entered inside the handle, simply lay all of the components out on a towel and allow them to dry overnight.