6v sealed lead acid batteries for emergency lights, backup systems, and many other applications. The best way of checking that you are ordering the correct battery for your system or device is to remove the old one first. Check the terminals that the old battery has and check the dimensions carefully. If you are still unsure, contact us, and we can decide for you. If you see a couple of batteries that seem close, you can always use our compare products facility. This makes it easy to take 2 or 3 batteries and look at the differences in our user-friendly table.