What do i need to use to replace an a23s battery...an a23 battery is not the same diameter as the a23s and does not work?

The A23 is same as A23s so they works same，if there is any question please contact the seller for replacement or refunds.

If battery fails before 5yr, what is needed to get replacement?

you didnt say, what the battery was in, that failed..

diameter 0.405 inch, height 1.122 inch.

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