Tommy Bolin

Don't give up yet!
I melted a battery post on a huge old 4v solar cell a few years ago, due loose connection/corrosion, not sure. Was in the lake cabin, not used much, therefore was not paying enough attention. Could have been worse.
I took a large old fishing sinker, built a mold out of sheet metal, and recast the lug on top of the remaining stump. Not perfect, but it didn't show voltage drop that I could measure, battery lived on until the whole bank died couple years later. Bank was almost 30 years old at the time, very expensive to replace, so very much worth the effort.
Took a couple photos of the process, if I can find them, I'll put them here.
As for you battery, if there is enough post left to charge and the battery will put out current, then it is worth trying.

If you are attempting to sell your home, and have installed one of these, without the permit you could not have gotten, then any moderately aware buyer's home inspector or real estate agent will likely flag it for further scrutiny. Portable, I suppose means just make it gone, pretend it was never there.
You will then have to choose to remove it, at your expense, try to get it permitted, at significant cost and aggravation, or cancel your purchase contract.
While your buyer may choose to accept it as is, perhaps demanding an acceptance of liability or your part, their homeowner's insurance likely will not, without certified installation and UL type approval. Many readers live in more rural areas where such troubles are less likely. To everyone else, good luck.
Right or not, we can argue or hope/wish, but we trade the market at hand, not the market we wish for.

Beksi watching the lake. Coyotes very pesky, wolves back. Cows leave soon. Dogs will be at a bit of loose ends. She is, I like to suppose, waiting for the lake to freeze into a huge snow covered playground/highway.
She and her siblings will spend the winter chasing the unwelcome intruders off.

There are two parts to the equation of life.
Energy and time. Energy, not in the sense of finding motivation, but of the ability to sustain oneself.
The most common way to acquire energy in most of our lives is money. Money or the acquisition of energy are fungible. The power of compounding means that there are almost infinite amounts of energy that can be harvested or created, almost infinite paths to do it.
You can bag on 'worky jobs', but money is the easiest to compound. When invested, it silently works, 24/7/365, growing, providing future acquisition of energy.
Investing in yourself, your skillset, investing in your 'home(stead)' wherever you live, means finding ways to wisely compound your labor, and therefore your ability to acquire energy. Most live with a balance of both paths.
Time, however, is not fungible. Finite, it passes no matter what, and cannot be created. It is the limit to the compounding part, or the future acquisition of energy. That should help frame a person's answer to the 'value' of time.  

We are then at approximately the same elevation, as is our Nevada home.

I like Basin. I remember in the early 70's when the highway still passed through town. I also remember the year, 1976? how surprised we were the Interstate was being completed to pass around. We had a cabin on the North Fork of the Sun, just south of the Bob Marshall. My dad was stationed in SoCal after his second tour, and we passed through every July until we moved back to Great Falls.
I also remember Elk Park just south towards Butte being one of those quirky places on the morning news with the lowest temps in the state, when it wasn't Butte.

+1 For the central utility chase/closet idea.
Add a chimney for the RMH, folks plan for chimneys after the fact often as well. Keep the heat in the center of the house, instead of giving half to an outside wall exposure.

Last days of stump season.

William Bronson wrote: Standard toilets do flush down.
Most commercial toilets go into the wall.

Do they then stay in the wall?? Or do they then also go down at some point?

Commercial units go horizontal for a very brief run into a wet wall, where they also go....
Down.
Pretty sure.
Built more than a few commercial buildings.
Either way, the problem is the same. If you stubbed your plumbing up through a floor or slab, and then change your mind......
Hammer up a slab or open a subfloor.

Anne Miller wrote:Usually all the plumbing is in the walls.  Why put plumbing in a raised floor?

Toilet drains go down.
Always. Pretty sure. Basements were not part of OPs question.
Only your upstairs neighbor has a toilet drain passing through your wall. Vents, of course, always rise through a wall. In wall one way vent caps can be used where a riser is not practical.

In places that never freeze, most plumbing could be in an exterior wall. Carving a drain line through a wall stud doesn't leave much framing meat for stiffness. Plumbing tends to be in 2x6 walls. Walls can be doubled or furred out for additional room. Soffits can be added to conceal overhead horizontal pipes.
Codes have requirements, based on common sense, and experience about the length of in wall laterals for drains and number of turns allowed, and the requirement for cleanouts.