Default recent update of whats app started draining battery on nexus

Recently whats app has started causing huge batter drain. Many times I see whats app consuming around 50% of battery. It has started happening fairly recently (probably after the last update). I have faced this issue on nexus 5 and nexus 4 however haven't heard this complain from non-nexus user. Any one else is facing the same issue ? Any work around ?