iphone keeps shutting off automatically , the battery indicator doesn't always indicate the right battery after it turns on
my iphone 7, that i have owned for about three weeks now, keeps shutting off automatically. this happened for the first time on sunday. after it switches back on, it doesn't seem to indicate the right battery. force restarting doesn't help. please give me a real solution, don't just link me to the apple support website; i have gone through everything. the battery health is 81%.
iPhone 7