Hello everyone My used Apple iPhone 5s was working well for me for about 6 months and I decided to sell it as I switched to Android phone for personal reasons. I factory reset the the phone and sent to buyer only to be returned by him for the battery drain problem. 10% battery charge is being reduced per hour even in Airplane mode. 1.5h used with 1hr talking and 3hr standby if used out of airplane mode. Moderate to high heat is being observed in left side of logo. Configured as new phone. Apple iCloud and siri are not enabled. Apple remote troubleshooting has confirmed that the battery do not have any problems. We have tried replacing a new non original battery as well. No water damage being indicated by the external sensors. My Apple iphone is bought in abroad and even warranty might have been expired. We can do any hardware modding as well to fix the issue. Please do not suggest me any power conservation tips as I was using iphone heavily for the past 6 months with any compromise. Please help me.