RAR archive of 4.35 MB tagged with the Nokia brand, but its name gives only Nokia-2, so the exact model, product code and contents are not stated. It may hold schematics, service documentation or other material for a Nokia handset; inspect the contents before relying on anything inside. Open it with WinRAR or 7-Zip and look for an RM or RH type code in the documents, then compare that with the label under the phone battery. Only use the diagrams when the codes match your device.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.