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That’s a DE-9 LocalTalk transceiver for use with Macintosh 128K and 512K. Those models used DE-9 serial ports.

The positive side of C8 connects to L3 next to it.

No, the Duos appear to use two LIR2032 cells soldered together and a little plastic connector to connect to the logic board. See this post for pics: https://68kmla.org/bb/index.php?threads/duo-270c-yay-or-nay.38012/post-411863

No, the PowerBook 150 uses PowerBook Duo memory modules. It’s an oddball as it was based on the Duo’s architecture rather than a cost-reduced version of the other 100-series.

No, the Plus and earlier use a much larger 4.5V alkaline battery. Something like this would be required to replace that soldered battery: https://store.retrofixes.com/products/macintosh-se-pram-holder

I would suggest using a MeowToast or MacBatt. They’re a small PCB that adapts a common CR2032 coin cell to replace a 1/2 AA lithium PRAM battery. The PRAM batteries are meant to be non-rechargeable in desktops, I’ve only seen NiCd or lithium rechargeable PRAM batteries in PowerBooks.

Appears to be a Farallon EtherMac LC based on the part number on the sticker (YPN592A-TP)