This is the 2nd Battery Pack! The last died this winter! Was probably because he was not used! Now that the weather is a little better again, my son, the RC vehicle from hibernation wake willed, but the battery was dead! When a new delivery is now specially with this is that even when not in use, the battery is on the charger often times! Seems to die often! The new works so again now! The notice we are aware now and the battery in resting phase longer maintain.