DJI Mavic Mini Combo Drone - Battery Defective

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This item was purchased new in December 2019.
It was flown only once for about 3 minutes at the time of purchase and has not been used since, so the condition is considered relatively good.
However, the battery is unusable.
When attempting to confirm operation for this listing, the battery could not be charged, and therefore operation could not be confirmed.
When the battery is inserted into the charger, LEDs 3 and 4 blink 3 times repeatedly.
Upon checking with official support, the following guidance was displayed: Due to abnormal battery communication, detailed inspection is required. Please use the online repair service.

This unit has not been affected by the new regulations introduced after December 2019.
The aircraft registration has not been completed.

Cancellations and returns will not be accepted after purchase.
This is a used item stored by an amateur. Please confirm the product details and only purchase if you understand and agree to these conditions.