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My iphone x dies at the 8% battery left and when I plug in again after start it show the 8.% charging mean thr bettery charging start at 8% and also dies at 8% can you please tell me the solution

Mubeen Gujjar  the battery gas gauge may be lying. At this point I would replace the battery since it maybe not holding the full capacity etc. Replace it and then re-evaluate. iPhone X Battery Replacement