The BLU Life XL can be identified by its model number: L050U. This smartphone was released January 2016, has a octa/quad core processor, Wi-Fi capability and a 13 mega-pixel rear facing camera.
If the phone is not heating up then u probably need a battery replacement and after the replacement if it still doesn't charge,check your charger and your charging port. Try cleaning the port with alcohol (spirit) with toothbrush. If still go for complete replacement