Leaving the phone charging will degrade the battery. If you leave your phone on charge overnight, you’re likely to be doing one of two things that will damage the battery’s lifespan. You are either letting it trickle charge for hours on end and letting it get too hot.
I charge my phone overnight so I have a full batt in the morning. I use a lot of my time doing my job on my phone, should I continue or better buy another one?
You should not leave your phone charging overnight for too long. It depends if you have the budget.