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hi, if i replace my iphone 12 battery with ifixit battery, does the battery health show up or not?

No, if you replace the battery in an iPhone 12, battery health will stop working.

i do not know 100% but knowing how APPLE is with their proprietary parts its kind of a gamble to expect that. ESPECIALLY Considering even OEM parts from THEM! dont work how theyre supposed to. IE the truetone feature when replacing with an OEM screen. i hope this helps

It will not show but you can just Use 3utools to check your health with a computer. Why in the heck would you change the battery such a new phone

Battery health will not show, and you’ll get a message showing that it can’t confirm you have a genuine battery. However, some places, (not many) will be able to spot weld the flex from your original battery to the replacement. Then reset the charge count. Being so new, if there are problems with the battery, Apple should replace under a warranty seems most of the 12 range will still be under warranty.