Hi Bora,
When a new battery is installed in a Surface device, the Windows battery report reflects the new battery’s internal data, not the old one. This includes the cycle count and full charge capacity, which are stored in the battery’s firmware. If the report shows a cycle count of 137 and a low capacity, it means the battery is used. The claim that the report shows old battery data is incorrect, it always reflects the current battery’s stats. Hope this answers your confusion.
Best,
Jeric