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Looks like both paint and battery damage to me. Zoom in on the chips just below what looks like the battery. There is definite corrosion on the 8 chips below the battery and you can make out some corrosion bubbling from under the "paint". Clean the "paint" off and then you should be able to make a determination whether or not you can salvage it from the acid damage problem. I don't think the corrosion is caused by the "paint" because the i.c. @ u100 has corrosion and is not in the splatter zone. But, first, get that battery off the board asap. If your new battery damage repair, this would be a good candidate to practice. If your at the point that you're considering just salvaging chips, why not practice your corrosion clean up skills.
It seems to be alkaline damage, which is a base, requires a mild to strong acid to neutralize it.
Zep acidic toilet bowel cleaner does a fantastic job of this.