I'm still new to the Smart myself, but I can help a little.
Only ever charge the Smart with a computer USB port using the original charging cable. The Smart could get fried otherwise! Make sure to unplug it once the battery is full for the same reason. Should take around 2 hours from a dead...
Unfortunately, it sounds like it's broken. Did you charge it at a laptop? I've heard of the Smart [and Digimon Vital Bracelets] getting fried when charging at something other than a computer's USB port and with anything other than the original charging cable. Bandai has recommended some third...
I started another generation and one of my Meets changed color with Lemon Pie and the other didn't. Maybe its existing color has something to do with it? I'm gonna try again with Omurice tomorrow when they're hungry again.
My brand new 5.5 has issues connecting to the battery. I think it's a bad connection. The reset button also doesn't work. Any way to fix? Once it detects the battery, everything works fine.
I found one at a place called Dream Playhouse Figuresell. It was the only place I could find, but they also seem to be an eBay seller. I'm not sure if they're legit, so buy with caution. I think I may have gotten the last one, but maybe they have more in stock now?