Searching a stable, not so much battery consumption, nice custom rom

could someone be so nice giving me a tip for a custom rom which is Android 4.4+ that is very stable and have long accu time.
it must not have the ultra super future functions and must not be the latest. Also don't need super kernel tuning switches.
At the moment i'm on 4.3 rooted stock rom and the features are fine for me.
Need only a newer rom for playing pokemon go ;)

thanx Michael