Laptop Won’t Turn On Without Adapter Despite Full Battery – Need a Fix

[Microsoft Windows]

When I press the power button on my 3-year-old laptop, the power LED blinks 5 times, but the laptop doesn’t turn on, even though it’s fully charged. It only turns on when I plug in the adapter. However, after turning on, the laptop lasts around 2 to 2.5 hours on battery charge.The battery capacity has significantly reduced over time, from the original 48,004 mWh to 26,996 mWh at 100% charge.Why is this happening, and how can I fix it?

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