#2) Proactively Prevent Corrosion
Even if you use the most expensive, high-quality batteries in your battery bank, it won’t be of much use if the batteries aren’t cared for and corrosion or acid is on them.
Before you assemble all of the components of your battery bank, make sure to individually coat the terminals, wire lugs, nuts and bolts with a non-hardening sealant.
You can also apply a thin coating of petroleum jelly to the battery terminals for some extra protection.
Lastly, seal exposed wire at a terminal lug using submersible rubber splice tape or something similar.
The reason all of this has to be done before assembly is because it ensures that all of the parts are equally protected. If you apply protective substances after you finish assembling the system, there is a good chance that dirt will get into small spaces that weren’t properly coated.