I don't see the iphone SE 2020 in you list for a replacement battery. Does the SE 2022 battery as work as a replacement for the SE 2020?
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Here's the needed iPhone SE 2020 Batteries and the guide to put it in iPhone SE 2020 Battery Replacement
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As @danj has pointed out, the battery is available here in the US. Are you not seeing it in your country-specific site?
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It does not. Some components are cross compatible (display in particular), but batteries of every new generation have a different connector. So even if the batteries are the same size, the connectors on the end are different so it won't connect to the logic board properly or the batteries will be different sizes, or cables won't reach connectors.
There's a really great comparison article of interchangeable parts here
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