Just dropped a Gen 1 battery while running around like a decapitated chicken trying to get my class groups ready. Dropped it from about 4.5 ft (1.5 m) onto a tile floor and it landed hard on a corner. The casing didn’t crack and it still fits in the brains, but the casing has visible discoloration now, as pictured.
Should I continue using the battery or throw it out, and if I do, what are safe disposal procedures?