iPhone suddenly unable to read battery health and randomly reboots

Just happened a few minutes ago. The iphone was hot to the touch, so I put it on my table while listening to music, a few moments later i hear my earbuds say disconnected, when i checked my phone it was on the apple logo. I continued using for a minute and then it rebooted. After that I went to check battery health and it says “service, iphone is unable to determine battery health. ( earlier this year I bought two new batteries for my phone the brand was called brand is HDCKU ) . So i have another iphone se that isnt used with the other battery and switched them. I then hard resetted my main iphone se but it still said service. My other se said battery capacity is at 100% on both batteries. Im thinking the heat might have damaged my main iphone se. What do I do?