If there is a world-wide recession through next year, lithium battery prices could drop. It's difficult to predict, though. I think prices have increased recently?
You're clowning us again. Everything he advises is 100% legitimate. When you get exposed, we're in for a epic meltdown. Maybe it's time to get off the internet?
Some of these guys have hydraulic crimp tools that "cold weld" the crimp connection. That seems very solid. I do the crimp and solder, and when you use rosin flux and the right technique, a good amount of lead will flow into the crimped connector.
Why are you so sure all the YouTube techniques have no value? Opinionated people make for stupid forums. Don't be a part of that demographic.
I think it's interesting to try these tricks and report the outcome. I had luck restoring one failed starting battery. The YouTube trick was trickle...
Running a generator to get extra efficiency on propane?
Can you run the electric component (ignition, blower motor) for propane heat from your solar inverter? There are catalytic propane heaters that use no electricity.
My credit card was also declined on AliExpress, which I thought odd. I never would provide other types of payment, either. I soon realized the product listing was a scam. It was for a battery built of 18650 li ion cells, but the specified dimensions were to small for the alleged capacity.