re: It's an upgraded RTG
Did you read the article? It doesn't look like an RTG at all to me. It's an entirely different technology. RTGs use decaying plutonium and thermocouples to generate the electricity. This technology is called betavoltaics. It uses a silicon wafer to capture electrons emitted by a radioactive gas, such as tritium. It is similar to the mechanics of converting sunlight into electricity in a solar panel.