It might be ok. Here's why:
The reason why you have to "register the battery" is because they charge the battery differently as it ages.
They do this to maximize fuel economy and to do this, they really just want to charge it when the car is coasting.
As the battery gets older, it needs to be charged differently.
Since your battery is new, it could be that they just decided not to charge it was much and hence the voltage is lower.
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