Energizer Hardcase H591S official Pictures. Energizer Hardcase H591S is a Smartphone of energizer. The Energizer Hardcase H591S Android Smartphone. Announced Feb 2019. Features 5.99″ Display MT6763 Helio P23 Chipset 5800 MAh Battery 64 GB Storage 6 GB RAM Corning Gorilla Glass 3. Energizer Hardcase H591S price starts.