My 2017 MacBook Pro can not be used without the charger. The computer does not work unless it is plugged in with the charger.
My 2017 MacBook Pro can not be used without the charger. The computer only works if it is plugged with the charger.
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Try an SMC Reset.
If an SMC Reset does not solve the problem, then you will need to have Apple or an Apple Authorized Service Provider examine the laptop to provide you with a repair estimate.
Apple has multiple free repair programs for a 2017 MBPro so maybe you will get lucky and the issue will be covered by one of them. FYI, here is the current list of the publicly available free repair programs for various Apple products (some products such as yours may have multiple programs available):