For a product to be sold it will be sold on uniqueness, price, or quality, or a combination of the three.
I believe that most of these batteries are built to a price not a standard, so it's a flip of a coin if you get a good one.
The worst culprits for reducing quality in the name of costs are the established companies.
Snap-On for example. Once synonymous with the best quality made in the USA tools; now:
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And the very worst offender in my opinion is Aston Martin.
An iconic British sports car now reduced to simply relying on the name to make sales:
Yes, this is an Aston Martin.
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Sorry for the rant.