Sounds like a bold twist on a classic algae setup, but keep a few things in mind. First, the energy budget—algae will make hydrogen, but the cells themselves have to stay alive and functional while holding the gas. That means a tough balance between photosynthesis, storage, and maintenance metabolism. Second, the containment problem; if the cells leak hydrogen, you get safety and regulatory headaches. And third, the ethical side—using living organisms as batteries isn’t just a technical question; you’ll need to think about the organism’s welfare and how you justify its use. If you can engineer a chassis that can safely buffer the gas and you’ve got a containment plan, the concept is fascinating and could give you a tightly coupled production‑storage loop. Let’s draw the flow diagram first and then dive into the metabolic constraints.