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You can’t buy a replacement battery through their official channels? Which country are you in?

You can pay for battery replacement, but you cannot buy a battery and replace it yourself. They literally refuse to sell you any parts

He wants to buy the battery from Apple’s suppliers. Not from Apple or an authorized reseller.

You cannot buy the battery from Apple or an authorized reseller. You can pay for them to replace it themselves, but they won't sell you the part.