I have a Predator Helios 300 (PH315-51).Apart from the original hardware there is a 1TB SSHD installed.Undervolted -140.6mV using throttlestop to help with thermals. My warranty can't be availed because this was purchased from another country. Earlier my original adapter had stopped working due to power issues. I got a replacement adapter (exact same) from my nearest certified acer service center.
Everything was fine until 3 months ago,while cleaning dust off my laptop I noticed that my battery had bulged. Even HWMonitor showed wear levels of upto 40% and the battery was not reliable. I got the replacement battery from a certified acer service center yesterday and installed it myself.

Only difference was the acer logo and the plug (old one was aligned correctly while the new one was not). However I installed the battery. Let it charge to 100% and then ran some stress test to drain it. After draining I fully charged it. HWMonitor shows a wear level of 3% for the new battery. Then I noticed the charging indicator, after fully charged it was blinking orange.
Video attached here : https://imgur.com/a/Xmj1ooS
No error beeps nor any error in Windows. Windows shows that the battery is charged and plugged in yet the orange blink exist. Also the blinking is random and not present at all times. Once it starts blinking then i need to unplug and replug the adapter to make it blue.I already tried Uninstalling both drivers for ac adapter and battery from device manager, using the battery reset pinhole button(10 secs press) and power cycle . Nothing helped .
Is the battery incompatible or is this a bios issue.I am trying to figure out how to reflash bios as it wont let me install it since its the same version. Any help would be appreciated .