How do I make my RYOBI 18V battery last longer?

Extreme temperatures	Extreme temperatures, both hot and cold, can affect battery charging. Make sure you store and charge the battery where the temperature is below 27 degrees. Prolonged exposure to temperatures below 0 degrees can also harm the battery. If you plan to use the battery in cold weather, store it at room temperature or slightly warmer before use.
Storage	Storing your battery in a discharged state for long periods can lead to capacity loss - store it partially charged. Store your RYOBI batteries in a location that's sheltered from extreme temperatures and humidity. Avoid exposing to direct sunlight, rain, or other environmental extremes.
Battery type	You may not be using the right battery for your tool or task. Where more power is required, larger battery packs are recommended. These batteries hold more charge and allow you to run higher powered tools. For example, the 18V ONE+ 4.0AH battery pack is suited to tools like Circular Saws, Reciprocating Saws or Belt Sanders where more power is needed for longer. For certain garden tools like Mowers, an 18V ONE+ 9.0Ah battery is recommended.
Maintenance	Keeping your battery and the contacts on your tools clean can ensure a better connection and longer battery life. Make sure it's clean and free from any dirt or debris. Clean with a dry cloth if visible.