HUGE battery drain; way above stock.
I only use this phone as a home wifi hotspot. No apps running on it, besides most bloatware uninstalled. Well:with stock ROM, I get about 8-10 h tethering. With this port, I get less than 2 h. So, back to stock.
Mate, for battery life, go for Xtrestolite MM (6.0). Best battery life I ve encountered for the S6