No. I can't find a legit battery for my Samsung phone, only forgeries and "compatible with"s. Local repair shop said they could put a new OEM battery into this 4yo second-hand phone

So I pay them and they do it. The result:

- back cover becomes rather loose while it's warm e.g. from fast charging or a hot day out. No longer waterproof

- the battery is no better than the original and is (2y later now) degrading faster than the original. If you ask a lot of it, the last 35% are gone within minutes. I think it's a knock-off battery but that the repair person doesn't know that

If there had been commercially available repair parts and tool access, neither would have been a problem and I could just have done it myself

My mom has the same model and sent hers in to the manufacturer for a battery swap. Took a while and cost half the price of the phone (since it was a 2yo second-hand at that time). That could have been much faster, even if the manufacturer is free to set the same steep prices

A colleague got their phone back from Google for some repair last week, I don't remember if screen or battery swap. He asked and they said it wouldn't be reset. He put a sticker on it not to wipe the device. They wiped the device. He's now trying to piece together what's in various backup files that Android allows making. Fun fun fun. Also not necessary if you, or your techy nephew, can just do it at home

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The requirement for commercially availability of repair is so much better than the current state of what repair places can/are offering

Last time I checked I’d have to leave my phone for a couple of days and the glue factor meant they wouldn’t guarantee it would come back perfectly. My assumption is this might make it a more trivial change.

My last phone was all glued and the entry point was the screen. The repair guy said there was a 50% chance the screen would break in trying to unglue it so it was not worth the try. It was a shame, it was a decent phone killed prematurely by a faulty battery.

There are a number of phone designs that require special heating apparatus and very careful prying tools to get the back case off. And then extremely careful application of new glue to reassemble. Basically the whole thing is glued together at the factory. Google "phone heating pad for repair" for some examples...