I cannot imagine those being as power hungry as 4. Hm... I think I had a similar issue with my old laptop. (I upgraded in January.) I do not remember every specific, but it was ridiculous how games in particular devoured its battery life. I got to the point that I pretty well never played anything unplugged. I do think it warned me, but being honest I'd never attempt to play anything below 90% charge unplugged.
I unplug my new thing, though. It could be a battery issue. 4 isn't the most optimized from what I understand, but it doesn't sound like it is crashing. You can try varying flavors of power saver mode and see if that helps, but beyond an upgrade (parts or otherwise) I do not really know what to do besides playing plugged.
