I bought these cheap batteries because I knew what they were. So far I've used 6 batteries and each one works. I can't say how long they will last, but I'll just change them out when the time comes! I paid a little over $5 for it and it makes about $0.06 each. Compare that to paying $1 for 4 at a dollar store. They can also replace silver oxide batteries in watches. I have used AG13 batteries in my children's toys. You can look up how to adapt AG sizes to other battery sizes on Wikipedia. For example, LR44 is the same as AG13, which is most commonly used in headphones and children's toys.[.]
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