Sealed lead acid batteries should be stored properly if not in use for an extended period of time to prevent damage and ensure they can be used again in the future.

If you need to store a sealed lead acid battery for 5 months or longer, it's recommended to:

1. Charge the battery fully before storing it. A fully charged battery is less likely to freeze or sulfate during storage.

2. Store the battery in a cool, dry, and well-ventilated place. Ideally, the temperature should be between 10°C and 25°C (50°F to 77°F). 

3. Disconnect the battery from any devices or equipment that it may be connected to.

4. Check the battery periodically during storage to ensure it is holding its charge. If the battery voltage drops significantly during storage, it may require a maintenance charge (jump-start).

By following these guidelines, you can help ensure that your sealed lead acid battery remains in good condition and can be used again when needed.

Please also see the following article, for more information on battery maintenance:  How to Replace the Battery in an ION Portable Speaker