This is the power state / charging LED. If this is flashing orange (or white/orange when the laptop is powered on) then there was a problem charging the battery.
Batteries age and eventually break, that’s sadly quite natural. Sometimes batteries can be revived a bit again or at least the charging error overcome.
For that I would suggest to power down the laptop, then power up again but keep it in Coreboot/Seabios or PureBoot or Grub, do not boot the OS. Then unplug the charger. If the battery still has some charge, let it run down until the laptop switches off on its own. Once it switched off connect the charger again but keep the laptop off, only the orange charging LED should be on now. Then wait until the LED either turns off or starts to blink again.
Sometimes the battery charger recovers this way. If it starts to blink orange again and eventually even doing so after comparably short time (like 10 to 15 minutes) then it is very likely the battery is broken - the charge controller detects that the voltage is low and that it does not come up by charging it, which usually means that at least one of the cells has gone bad.