Corrected entry: Batman takes the shock gloves from Electrocutioner's body, but he doesn't take the battery packs that charge the gloves, just the gloves themselves. Later, he fights using the gloves despite them having no power source.
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Correction: Having built all of his own gear, Batman is skilled enough in engineering and micro-circuitry to rig up a power source smaller than the Electrocutioner's gear to operate the gloves.
Captain Defenestrator
If he isn't shown building the circuitry, it's a valid mistake.
Doc ★
I think that's a reach - just because we're not shown something doesn't mean it doesn't happen. And Batman's gear clearly has a power source already.
We didn't see every stage of the construction of the Batmobile either, but it exists. We can presume there was some time-compression where we didn't see Batman yank wires out of the walls and make spot-welds on circuit boards. Just because we didn't see that doesn't mean he didn't.