The RTC battery connector (JST SH 1.0mm) for the Raspberry Pi 5 didn’t fit, so I did some research and found that the MOLEX 51146 is compatible.
The product description says “ultra-thin,” and I’m not sure if other types exist, but it won’t fit unless it’s thin.
https://ja.aliexpress.com/item/1005011557685518.html
I used a battery holder I already had on hand.
You can find similar products on sites like AliExpress.
The holder comes with a switch, but I didn’t need it for this application. (It stays ON all the time.)
https://ja.aliexpress.com/item/1005006365822576.html