This is less world-shatteringly widescale informative than the other power uses here, but Gil still used Path to Profit to try and work out how to make a more efficient battery for the Magnators.

Gil wants to use Path to Profit to work out how the locals, with particular focus on Magnators, Nectors and known information on the Towers, would be able to make more efficient batteries than their shitty vinegar ones. His goal is a car battery but he presumes that's not especially realistic, given the circumstances, and will be happy with like. A D-cell or AA equivalent.

Nectors could fabricate everything needed for molten salt thermal batteries - desalination work is already a big part of that they do. They need to be hot to work, but could be stored near campfires, ovens, and forges to gather charge. Sodium thermal batteries are about 3 volts; double a D cell, and are rechargeable. The battery needs to be welded shut; but compared to acid-based batteries, the technology needed is simple. A heated battery discharges electricity as it cools and has a lifespan of a few hours.
Batteries like this would not be very portable, given temperatures, but could easily be public utilities - one at every cookfire or oven.

Using information from the Towers, it would also be possible to build deep-sea wells that draw up thorium-contaminated water. The thorium, cleaned out of the water, could be used in nuclear thermal batteries - but that's a much higher level of tech.