Brilliant. I've just picked up a Nintendo Dalmatian for my granddaughter. It's sturdy, well built, but as you suggest the battery box was decidedly dead. Fortunately I've kept a couple of old battery boxes from other toys and successfully renewed the box terminals. No movement except for front legs, so I'm going to strip the outer skin of the dog and lubricate the joints. You worried me a bit with 'renew the motherboard'. Really?? Oh well, I'll keep trying. Definitely I'd offer you points for your article - if I knew how. So - thanks.