Micromax Bolt S300 official Pictures. Micromax Bolt S300 is a Smartphone of micromax. The Micromax Bolt S300 Android Smartphone. Announced Mar 2015. Features 4.0″ Display, Spreadtrum 7715 Chipset, 1200 MAh Battery, 4 GB Storage, 512 MB RAM. Micromax Bolt S300 price starts.