Roomba Rumba Grumble

I bought an older 400-series Roomba robot vacuum off Craigslist around Christmas and it ran wonderfully the first time I plugged it in. It cleaned the bedroom...

... and then "doooop dodoop dooop!" It died.

For the past 5 weeks I've been researching online in my spare time, trying to find information on how to save my poor little Arthur.

This is a list of my currently available options:

1) RoboticVacuums.net suggests trying to reset the unit. (Inspiringly not helpful.)

2) RobotReviews.com instructs you on how mod your own battery pack with new NiMHs. (Cost and work involved is not necessarily worth it.)

3) Buy a new battery from Amazon.com, though many of the vendors won't ship to my Canadian address. (This one does, and it's only $23?)

4) Junk the unit. Not cool.

5) Get a refund. Also not cool. (Probably not possible.)

Knowing my limited options, it makes it much easier to choose a path. That being said, I've been looping around #1 for the past few weeks with little or no improvement. I keep thinking: well what if I do it this way this time?

"Dooooop dodooop dooop."
I'd better move into Phase 3 soon, I'm missing out on some prime robotic cleaning time. (Plus that song is driving me nuts.)