In retrospect I should have known this might happen -- I pushed my TravelScoot too far today. I zoomed through one Walmart, and then a second Walmart. A motorcycle guy walked into Walmart at the same time I did, and he was obviously impressed. "Wow, you got on that thing and in here fast!"
After a break at home I did BOTH floors of a huge mall, then Sam's Club. I was by myself and moving fast. But even so, that was all just fine. The fatal mistake was deciding to drive from Sam's Club across the Sam's Club parking lot, across the street, across the Walmart parking lot to my third Walmart of the day. I was going in the door when it happened. The battery light flashed yellow and then it flashed red, and then all power was gone.
I think I overloaded my lithium ion battery, but I didn't have my charger with me to fix it. I folded my scoot up and put it in a cart and took it back to my car. The battery is charging now.
I'm thinking a backup battery might be a good thing. Especially for days like today. (Or going to the Smithsonian at the end of July!) I also need to read the battery manual again.
What was I looking for in Walmart? A specific brand and model of a digital camera. I want one small enough to carry in my purse. It's now on its way from Amazon.com. ;-)