Check your cooling settings in power properties. Control Panel, Power Options, select ' change plan settings' in your plan, select 'change advanced power settings' in the window and you should get a pop-up pane. In the pane expand 'Processor power management', expand 'System cooling policy'. If it shows 'passive' click on the passive then a dropdown menu should open and select 'Active'. Then the usual apply and ok.
If on active already change your power plan to 'High performance' and checking sus cooling still on active.
It just might be Acer's own power plan causing the problem trying to save the battery.