I don't know how these batteries perform as I have no idea how to test them, but I am disappointed that they don't have an expiration date on the batteries, or even a date when they were manufactured. I sure hope they don't leak like an entire package of EverReady batteries that still had a long way to go before they expired did when I opened the package up recently. I'll be keeping my fingers crossed that they perform as expected and won't leak until the end of their life.
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