My Macbook shows 0% charge all the time and it doesn't get starts without connected to charger.
My Macbook shows 0% charge all the time and it doesn't get starts without connected to charger.
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It sounds like the battery is never charging.
First, read If your Mac battery won't charge - Apple Support.
If none of that helps perhaps the power adapter and / or cable may be defective. Depending on your model MacBook, read
If your MagSafe cable or power adapter isn't working - Apple Support
If your USB-C power adapter isn't charging your Mac notebook - Apple Support
If the battery has been left in a discharged state for a long time, it may need to be replaced: Find how to service or repair your Mac.