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This "heated core warmer" may be either one of two things. It could be a bsttery operated heater or a eutectic salt solution pack.
Patco, a maker of canister lights makes a line of electric heater pads for use with dry suits. The system uses the same battery canisters that they use for their lights. A bulkhead connector is installed in the drysuit to facilitate the electrical connection. The battery canister is carried outside the drysuit in the same manner as the battery canister for a light.
Another system uses heavy-duty flat plastic puoches which contain a eutectic salt solution. When ready for use, the solution is a clear liquid. Suspended in the solution is a small metal disk. The user flexes the metal disk in a snapping motion through the bag. When that happens, the salt belins to crystalize, giving up its latent heat. The reaction continues for some time and the pack can get quite hot. The pack must be enclosed in a cloth bag of some kind to prevent direct contact with the skin which could cause burning. When all the salt is crystalized the bag is hard and rigid. To regenerate the salt and turn the solution back into a clear liquid the pack is placed in boiling water. The advantage of this system is that it can be used with either wet or dry suits. I am not sure what companiy or companies make or sell these devices, but they have been around for many years.
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