Hi all hope someone can help. My sons Asus Laptop G751 JT started saying ''plugged in charging'' but was not charging and when the power cable came out the laptop would shut off. We thought it was a bad battery and I took it into a repair facility and they replaced the battery. We have now had it home for two days and it seemed as if it was functioning well but now it is stuck at 80% and will not charge more and again when the power cable come out it cuts off???? Can someone please help...