What makes you doubtful about those Sony
batteries authenticity?
Some of my Sony VTC series
batteries came with the same sticker that you have stating capacity, nominal voltage and size.
This is done due to the fact that those
batteries were never meant to be directly sold to consumers and lack the labeling of a consumer battery. Hence the sticker taking care of that.
I always use trusted vendors when buying batteries. Trusting an anonymous ebay or amazon seller is a gamble and batteries are the most important part to get right.
I fail to see the wisdom/logic of buying powerful batteries that are going to be right up against my face from unknown vendors that may be just re-wrapping any old battery they have laying around.
Where did you get them (an ECF registered vendor or from ebay/amazon/alibaba)? Do they perform as expected?