Batteries are shipped in a partially charged state to comply with shipper’s recommendations. It is recommended that the battery be charged for at least 5 hours the first time. Sequential charge intervals will vary based on how much the battery is depleted but after the first charge cycle it should be about 3 hours to recharge to a full state. It is also recommended to store the spare battery in the charger, as it is a smart charge and will revert to a trickle charge when primary charging is complete.
It is important to learn the indicator light colors on the charger base because these will indicate the battery status (see the Operator User Manual or Directions for Use).