Hey, so recently switched from the s8 with one carrier and upgraded to the s20+. Was planning on giving s8 to the child but now it won’t turn on. Been charging it for 4+ hours and it started vibrating every 5 seconds. Tried the volume up and power button and the volume down and power button. Nothing. Just recently I tried the volume down button and the bixby button and now every time it vibrates, the title screen flashes. If we unplug it, it goes dead again. Is it just the battery that’s fried or is there something else I can try. I can’t get the backing off to actually check the battery.