hi i have a Lenovo G510(i7-4700mq 2.4ghz , 6m , 8gb ram , 1TB + 8gb ssd ,15.6 amd 8750m) and i have a battery issue when it is full charged it only stand for 1h34mn . i've been using the laptop for 4 month and this problem just happened those days . i've noticed also that the fan is running on full speed and the T is about 76°c on normal use with no gaming ( i've never used games) what do you advice me to do