We offer a range of different alarms, each of which operates in a slightly different way. Some of our alarms have rechargeable batteries, that do not need to be replaced. Some have replaceable batteries, while others are not replaceable and you will need to purchase a new button when the battery runs low. Our SureSafe 24/7 Connect range comes with lifetime free pendant replacement when the battery is running low. Our user guides and instruction manuals can be found here. These will help explain how to change the battery on your personal alarm. If you are struggling to change the battery of your personal alarm or have further questions, then give us a call on 0800 112 3201. One of our customer services representatives will be happy to help you.