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Casios can do some weird things on installing a new battery, and you're being more adventurous than I would with the circuitry. I have zero experience or tools to deal with that, although I keep possibly dead modules (just in case). I'm surprised there's differences in the modules; that series only used the 261 (says Google) so I can only specuate on what and why things were changed
Formerly_user_144439-
Regarding your possibly dead modules, bloke who makes a bunch of overhaul vids says persistence can pay off; don't give a watch up for dead after one try. Shorting the AC pad is the first thing to try, then you can try giving it a bit and reinstalling the battery. If that doesn't work, he reckons a bit of warmth has often done the trick, like leaving it in your pocket for a day and then having another go.
Kimmo
Okay, some good news - I was reluctant to short the AC pad because I wasn't sure what to short it to, but after watching a couple of repair vids I gather the done thing is to short it to battery negative. After doing that, the freezing and pausing behaviour is gone, thankfully...
Although I still can't figure out how to adjust it or what the upper two side buttons are for...