My hunch was that S2 is the marking and the last two digits the date code. A quick search for “s2 sot325” turned up this page https://www.s-manuals.com/smd/s2 , of which the following item looks very promising, given that marking and date code format, pin count, and nearby silk screen all agree: https://www.s-manuals.com/pdf/datasheet/l/a/la9010_r01_inno.pdf
A 4.2V lion charger, in a product that uses NiMH batteries?
I don’t know anything about the battery type in the walkie. I simply proposed a
candidate (my exact word being “promising”). It’s certainly not unreasonable to think it could be a charger IC when one of the nearby pads on the board is BAT-.
It’d still be incumbent on the OP to verify circuit design, etc., and in this case, the contradictory battery chemistries would throw up a red flag. That’s the OP’s job, not mine, so don’t lash out at me!
The company logo isn't even close either.
It’s not a facepalm for the logo to not match. Companies can (and do) change their logos over time, you know! Or a company gets bought out, or sells a product line… many reasons
other than facepalm-worthy stupidity for a logo to not match.
No, what you have is an ME6211C33M5G. Search for images of this part and you'll see the match.
I agree, it looks like a more likely candidate for what the OP (not me!) has, based on images. (The datasheet, on the other hand, doesn’t describe marking them with “S2”.)
This is the second time within this week I've seen that logo...
Well aren’t you special!