Samsung j7 is big screen device with super amoled pannel. It has 16gb inbuild storage with expandable memory . It has 1.5 gb ram which is good for multitasking but it is still 720 px display which is disappointing with graphic card 405 andreno which is good to handling big graphic games .
Battery of j7 is 3000mah which run one full day without any issue .Currently device run on lollipop os .Samsung generally not give there update on android mrshmallow