Lenovo X1 Carbon can"t turn on without AC power

Nov 26, 2018
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Hey, I'm using a Lenovo X1 carbon and I can't seem to turn on the computer without plugging it into AC power. But it can run normally once I plug in the power, but a lot slower than originally. However, the moment the power is unplugged, the computer dies again. Prior to this, there was a "System CMOS checksum bad" error so I replaced the CMOS battery and the error was gone but now I have this issue. Do help please!
 
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