Recharge time is stated as the time to bring a completed depleted battery back to 90% of its charge capacity, once main AC power is restored. This time is typically about 5 hours after complete discharge into 100% capacity load. This time will be greater when charging additional external battery cabinets used with the larger UPS models. Of course, much less time it required to recharge the battery when it has only been partially discharged. Note: connected equipment will be operational while the batteries recharge.