3500mah Smart Power Bank External Rechargeable Backup Battery Charger Charging Case Cover for Moto E Xt1021 Xt1022 Xt1025 (Black) 3500mah Smart Power Bank External Rechargeable Backup Battery Charger Charging Case Cover for Moto E Xt1021 Xt1022 Xt1025 Design perfectly fit and Original for your Device Ultrathin design and perfect dimensions. Super lightweight and convenient to carry Works both as an external emergency battery and a protective cover Smart Battery (Optimized to lengthen your Phone performance time; No more out of power dilemma during important phone conversations)