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The best option is to go via Apple. Cost varies by country.
 
Apple 100%. The "Battery replacement" is essentially a swap for a remanufactured iPad, which is new enclosure - new display - new battery. The only thing that's "Refurbished" is the circuitry inside.

The only "issue" with Apple replacement is that the battery has to be below 80% of original value, on their test. If you're not sure, chat/call AppleCare and they can run a remote diagnostic to see.
 
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