When the LED is green the battery charge is between 95% and 100% and the AC power is on. The orange/amber LED indicates that the battery power is below 95%, and the AC power is on. Without the charger plugged in an orange/amber blinking shows the battery charge is below 10% and needs a charge.
However, if your laptop battery percentage is above 10% and the LED keeps blinking orange/amber it may mean the battery needs replacing.
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***Lithium-ion cells age the moment they leave the factory***, plus the ~500 cycles they can do (to 80% capacity considered EOL). That means the batteries in the long termed stored laptop will be degraded, even without having been cycled or used.
When the LED is green the battery charge is between 95% and 100% and the AC power is on. The orange/amber LED indicates that the battery power is below 95%, and the AC power is on. Without the charger plugged in an orange/amber blinking shows the battery charge is below 10% and needs a charge.
However, if your laptop battery percentage is above 10% and the LED keeps blinking orange/amber it may mean the battery needs replacing.