Proper storage of RC car batteries is essential to ensure optimal performance and prolong the lifespan of your batteries. Here are a few tips on how to store your RC car batteries properly:

1. Keep batteries cool and dry: Always store your batteries in a cool and dry place, away from direct sunlight and high temperatures. High temperatures can cause damage to the battery and decrease its overall lifespan. Avoid leaving batteries in direct sunlight or in a hot car.

2. Store batteries at the right charge level: It is recommended to store batteries with a charge level of between 50-75%. Storing batteries at a lower charge level for a long period of time can decrease the capacity of the battery, while storing at a higher charge level can cause damage to the battery.

3. Keep batteries away from moisture: Avoid storing your batteries in damp or humid areas, as moisture can cause damage to the battery and decrease its overall lifespan. If the batteries get wet, dry them thoroughly before storing them.

4. Keep batteries in a safe place: Always store your batteries in a safe place where they won't be damaged or get lost. Keep them away from children and pets, and never store them near flammable materials.

5. Use battery storage cases: If you're going to store your batteries for a long period of time, it's a good idea to use battery storage cases. These cases are designed to protect your batteries from damage and maintain the right charge level.

6. Keep a record of storage: Keep a record of when and where you store your batteries, this will help you to identify when it's time to replace them.

By following these tips, you can ensure that your RC car batteries are stored properly, and prolong their lifespan. Always check the manufacturer's recommendations for the appropriate storage of your specific battery type. It is important to remember that the lifespan of the battery depends on how well it is taken care of, so it's important to be diligent in maintaining and storing them properly.