NephSF

Hey I'm new to this vape stuff and need help understanding why my battery is get HOT. I received a " Vandy Vape Pulse BF kit " as a gift. I started using it and the mouth piece part was get hot enough I'd snap my head away from it burning my lips . That eventually stopped but I noticed the battery started to get hot. Can anyone help me fix that, or guide me in the direction of what I should do?