Energizer Hardcase H621S official Pictures. Energizer Hardcase H621S is a Smartphone of energizer. The Energizer Hardcase H621S Android Smartphone. Announced Jun 2021. Features 6.2″ Display, MT6762 Helio P22 Chipset, 5000 MAh Battery, 64 GB Storage, 4 GB RAM. Energizer Hardcase H621S price starts.