This rechargeable fan battery with 6V 4.5Ah Ctype lead-acid battery can last up to 45 hour/LED Fan: 3 hours/high 5 hours/low, Charge Time: 12-15hours. Please charge properly before you use it for efficiency and ruggedity sake. Its also one of the most rugged battery ever produced. Its reliable, dependable and efficient. It can also be used for various rechargeable lamps. It can work with any rechargeable fan that uses 6v 4.5 or 5.0AH.