I just flashed Rubix to Apex and getting horrible battery life getting about 8 hrs where as on rubix i was getting nearly a full 24hrs... as researching i've heard nothing but good reviews on the battery life has anyone else encountered this issue or know a fix or what can possible be eating up the battery?
This is common when switching between any rom. You don't actually have bad battery life, what happened is that your phone lost "relative points" to compare your battery power, so it can think your battery is lower than it actually is.
To fix: charge your battery to 100%. Reboot to recovery, go to advanced and wipe battery stats.
You should find your battery life a lot better after that.