For now it does have battery drain, but it should be fixed in the next build(according to what the dev said).
This CM13 here doesn't support A3FU in the first place. LOS 14.1, on the other hand, does. If it didn't work, you just did something wrong. Try installing the latest LOLLIPOP firmware via Odin, perform a factory reset and let it boot, after that flash a compatible twrp recovery and flash LOS 14.1 again.