Battery replacement complete! It's on the charger now. When I first plugged it in with the new battery, it shone a solid red light beneath 'charge' for a few seconds. Then it changed to a solid red light with a blinking green light overlaid on it for another few seconds. Finally, it changed to the blinking, green charging light.
Here are some pictures:
The inside of the Solo's sheath was rather dirty.
A Solo in the nude with the old battery exposed.
The tight fit of the wires beneath the old battery.
Another view of what lay beneath.
And yet another, this time with the old battery removed.
Putting the new battery in and aligning the wiring.
The new battery fitting snugly in the chamber.
Unfortunately, I lost a small chunk of my face plate and bottom plate that had already been hanging off for several months.
Now to wait many hours for it to finish charging
EDIT1: The site I'm hosting these images on seems like it might be slow right now, so YMMV on loading them (especially with a slow connection).
EDIT2: I optimized and resized the images, so they should load more quickly.
EDIT3: Any thoughts on what I should do with my old battery? Recycle it? Save it in case I ever need it?