It is best to store at 30% to 50% charge, and keep it at moderate temperature. If storing for extended periods of time (>1 month), it is best practice to disconnect the battery from the motor controller. For shorter periods, the charge state does not matter as much, but try to avoid storing in cold/freezing environments.

You can learn more about how to unplug you battery for long term storage by reading our guide here:

How to Unplug the Battery for Long Term Storage