Many newer, higher-end, openers incorporate battery back-up packs as a standard feature. A battery back-up pack ensures your access in or out of the garage. This is an important feature during times of inclement weather or a power outage.
A battery back-up is an insurance policy for your peace of mind. You may need to rely on it very infrequently, but it is money well-spent. When you need instant access to your home or garage, this add-on will be a major convenience and added safety and security.