The phone comes with a 4.30-inch touchscreen display with a resolution of 480 pixels by 800 pixels. The Samsung Galaxy J1 4G is powered by 1.2GHz quad-core it comes with 768MB of RAM. The phone packs 4GB of internal storage that can be expanded up to 128GB via a microSD card.I’m VERY new to these Android devices(only owned 2 "cheapeez" previously).So, with that I ask can I replace the Li-Ion 1850 mAh battery w/ say a 3000 mAh?Pls, someone reply w/ your wisdom n knowledge for this old(er)geekster.@JIVAN