I've made simple schematic for a UPS for Raspberry Pi. It contains a 12V Lead Acid Battery (40Ah), 5V LM7805 regulator and some capacitors. I'm supposing max 1.2A load from Raspi.
Should I add something? I'm totally noob at designing that type of circuits.![This is it](https://i.stack.imgur.com/beL4b.png)