first set of 10 batteries (of 5 sets of 10 packs) Test most batteries 1/2 on a conventional coin operated battery tester which has tested other batteries of the same size well. I do not recommend this. There is NO date code on the packaging so it's impossible to tell how old they are. Let's assume they were very old - due to oxidation between the battery contact sides - not visible until the box is opened.
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