The Brewdolph Face Mask Rudolph Drinking Beer shirtr is Strengthen Lightning. Take power from her power cell using whatever neosteampunk tech uses for USB, run that through your metal block enchanted with Strengthen Lightning, add a transformer stage enchanted with Transform Lightning if necessary, then plug the output into her charging port. It will be as clean as her own power regulation hardware can provide and will last as long as she doesn’t run completely out of power. A variant of this would use a rechargeable battery instead; with a depth of discharge of fractions of a percent, something like that could provide startup current for the enchanted power brick, charge itself in the process and last for at least a couple of years. (If you only need a startup pulse to establish a physics-breaking positive feedback cycle then a piezoelectric igniter from a lighter or a hand-crank generator from a radio or flashlight could work as well and be more durable.) As an extra advantage, she could use it during rest periods and not have to carry it around day to day. I’m sure Wallace would see the blatant weaponization potential.
Brewdolph Face Mask Rudolph Drinking Beer shirt, Hoodie, Sweater, Vneck, Unisex and T-shirt
Anything involving Movement could use automotive parts (alternators or DC motors / generators) and batteries for Brewdolph Face Mask Rudolph Drinking Beer shirt. This one would have a lot of potential for wider use once the basics are understood, but I think the story would lose something if Wallace had access to unlimited levitation powers for logistics. The less straightforward answer is Communicate Lightning or a variant of his heat transport spell tuned to work on electrons. Use it like a thermionic valve, with the spell providing energy to strip electrons off of a donor material onto an acceptor which provides your anode and cathode. This one has reliability and control problems, but should be pretty simple to get working.
Best Brewdolph Face Mask Rudolph Drinking Beer shirt
Another variant would use a thermoelectric couple with the Brewdolph Face Mask Rudolph Drinking Beer shirt transfer spell providing the gradient. He’s not going to have the fancy semiconductor-based devices unless someone in the hotel has a solid-state cooler, but you can make something that works with just iron and copper. This solution has the additional benefit of providing heating and cooling as a side effect.