From what I've been told, a coal stove can burn wood, but a wood stove can't burn coal.
Not much knowledge about your wood boiler. I'm on season 12 with mine and didn't need to keep up with the market. But mine is a pressurized, gasification type that has a forced draft, very efficient with the wood but just the blower is (iirc) 1/3 hp and I don't know if that's in the range of a battery as a power source.
You concern with a "regular" wood boiler "burning out the tank" is correct, but due to the fact that most of the old smoke dragons are "open" to the atmosphere. (non pressurized)
The oxygen in the water in an open system is a recipe for corrosion.