Quoted from Yellowdog:The worst battery damage is from the outgassing not actual dripping. I rarely see where fluids have dripped from a battery onto a board. Normally you just see a fan out pattern from the battery holder as the outgassing occurs once the seal is ruptured.
On Williams video game boards the battery holder is located at the lower left corner. The damage is above and to the right where it is impossible for the batteries to drip (unless your gravity works differently than mine).
Leaky batteries leak. The acid does not run like paint, it seems to migrate and wick around, similar to oil on cloth, mostly downward.
Got any photos of gas damage that 'normally' happens?