For optimum performance, Foxpro recommends the use of rechargeable battery cells to power Foxpro digital game calls. Save money and improve performance with Foxpro 10 cell rechargeable battery pack. No more hassle of constantly purchasing alkaline batteries. Be prepared in the field with this 10 cell battery pack/charger kit. It is compatible only with the FoxPro ShockWave and Hellfire. Kit includes dual rate fast charger, (1) 10 cell welded battery pack (Battery pack must be removed from caller to charge). This charger/battery set is compatible only with HellFire and ShockWave units. The kit includes 1 10-cell welded battery pack 'low self discharge' batteries for maximum performance and reliability, and a standard charger.