Batteries are the future of home energy consumption. But where do you put them? In the garage, or the side of your house? French startup Lancey has a more discrete solution: inside radiators. The team is already producing electric heaters that have a 600W or 1200W battery inside. If you have solar panels, or another form of energy generation, they can theoretically store the resulting power and conveniently heat your home when it's cold. Alternatively, the battery can serve as a distributed grid system for energy providers, drawing electricity at quieter, cheaper times and warming your house or apartment during the busier, pricier hours.