I'm still on El Capitan on my 2012 Retina Macbook Pro (2.9gz i7 processor). Most of the time I leave it plugged in as a desktop, but sometimes I use it unplugged and wanted to see what people have thought of the battery life on it. Is it better than El Capitan or about the same? I know everyone will have differences in time wise due to use, but in general, I'm just wondering how the battery life is before upgrading