The same problem is occurring world wide. I bought this phone here in India about 2 months back on 14 Aug, and on 28th OCT it suddenly started draining very quickly. On check up with service centre they said "the battery has swollen and it is not covered under warranty." The worse they denied to replace it even under the warranty period saying that battery swells because of overcharging, user is responsible for swollen battery. The hell ... Samsung is sucking blood out of its customers... they are selling high price products calling it there flagships and that ship sinks within 2-3 months of usage. I and thousands of customers of galaxy S4 like me want the battery replaced with a genuine battery... here in India too. and please Samsung!!! stop making your customers fell like illiterate fools when they visit your call your after sell services.