Replacement battery for HJC CB-50 Tandem Pro Kit standard intercom…. Specifications: 700mAh, 2.4V, Ni-MH. Compatible with: HJC CB-50 Tandem Pro Kit standard intercom system, CB-50. Replaces: ChatterBox CB50-BATT. ChatterBox replacement battery designed for Headset devices. Built to deliver the same performance as the original.