This 2.9 Ah DC battery pack (part C223-1800B) is the replacement battery for Volt R10CV and S10CV, CleanMax ZM-800, Tornado ROAM, and VBU cordless vacuum models. The 2.9 Ah capacity provides extended run time per charge compared to lower-capacity alternatives. Replace when the battery no longer holds a charge or run time drops significantly. Confirm the voltage rating of this pack matches your model's specification before ordering.