Overview 12V DC, 90-Amp Replacement Battery for HCRK and HCRK-INT Medical-Grade Mobile Power Retrofit Kits. Sealed lead acid, maintenance-free, spill/leak proof, AGM battery, simple plug-in connection with included cable Included in the HCRK and HCRK-INT. This is the replacement battery for the HCRK and HCRK-INT battery.