Same story here on Iphone 8. Inconsistent battery precentage. Go to sleep at 75%, wake up on 1%. Reboot, back to 45%, drops fast to 35%. Stays on 35% for 1 hour, drops again 12%, ... I used to have the same issue with my iphone SE back in the days. But not so bad like today with the Iphone 8. The only good thing is that it only looks like your battery is dead. It's acutally only the battery percentage indicator that is fooling you. This is, what I suspect, only a deceptive trick from the "apple sales machine" to make us buy new phones. As I heard, they're already convicted for these unethical practices. So this confirms they're still doing this sh*t. Therefore I take my conclusions and, considering the current ecological challenges we face, decide to never ever buy an Iphone again. They've lost a client, they're not lie awake about it but neither am I. :-) So long apple! Ps.: to all the other fellow sufferers here: I strongly suggest you also think about this and stop supporting companies like this. This is one of the reasons our planet is getting pushed to its limits. If helping our planet isn't a valid argument for you, then just think about the money they're stealing from you. It's already an overpriced cellphone and on top of that they're deliberately breaking it for you too. Think about your kid taking your expensive Iphone and just smashing it to the ground. What would you do? They're just doing the same. Sincere greetings W from Belgium