Answer from Production: These are really good questions Peter - we got a charge out of reading them. Heh, heh.
Tomorrow we'll do an update with more performance/feature/spec information, but for now...
1. Romo's power source is an NiMH battery pack custom made for us by a factory that manufactures Roomba battery packs called Corun.
2. It's not replaceable.
3. Battery life is ~2-4 hours, and you recharge using a custom mini USB cable that's included. Our electrical engineer Pat explains it like this: "We count on 4 "motor-hours" of use. So one motor spinning constantly for 4 hours, both motors constantly on for 2, stop-start so that they're each on roughly 1/4 of the time gives us about 8 hours. That's based on the motors drawing 1A current, and a 4.8Ah battery." We've clocked charging times at ~4 hours, but it can be longer depending on what you use as an outlet (wall adapter, laptop USB port, etc). We recommend you treat your Romo sort of like a phone. Plug it him in overnight, turn in, and he'll be ready to greet the day when you wake up. Alrighty then. More than you ever wanted to know about Romo's battery power, eh?
4. We don't sell spare battery packs because we don't want you to crack the shell, which is why we're offering a 1 year warranty and prepaid returns. Ship them back to our Romo Hospital in Las Vegas and we'll recondition or replace your Romo.
It may be crazy but we believe it should be done - you can read more details here: http://romotive.com/help#legal
5. Other parts that may wear are the treads. We'll be offering replacement treads on our website soon, but we've also picked an easy-care, durable silicone for their material. You can also remove them, wash them by hand or put them in the dishwasher, and then put them back on your robot.
Other than that, you'll have to tell us as you and your Romo enjoy a long life together.