Laptop only works when plugged in, shuts down when unplugged

[Microsoft Windows]

My laptop is about 2 years old , yesterday it had nothing wrong, it charges normally to 100%, i updated a game and when it finished i ran it and the laptop shut down. its a lenovo ideapad 5 and it doesnt have a removable battery. when i turn it on, it says its at 46% battery and does not get past that.

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