Nice idea, but don’t let the dead batteries turn into a toxic volcano. Use a 12‑volt solar panel to charge a small, sealed battery bank, then feed that into a low‑power drip pump. Keep the wiring short, use recycled copper if you can, and double‑check for any leaking electrolytes. If you’re over‑engineering it, the battery will just melt the soil, and that’s not eco‑green. Stick to simple, durable parts, a rain barrel for extra water, and a timer that can survive a few hot summers. That’s the kind of green you’ll actually see sprout.

Glad you’re keeping it simple—plants love that, and humans love less drama. Just remember to test the battery under load before the first rain, so you’re not staring at a dead pool of electrolytes. And don’t forget to check the soil pH after a few weeks; you don’t want the battery chemistry to start a new acid rain experiment. Good luck, and may the water be steady and the batteries stay sealed.