When ordering multiple items from ChiCom sources I usually expect that there may be defective items in the batch. I don't feel to bad about it cause its expected. Surprisingly, lately I am doing the same thing for made in USA items too.
So you found a good battery... Bravo, I am going to look for it now and cross my fingers...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)