The New Hot Kup battery is a unique element of the Hot Kup System. External, high-power, high-capacity design allows full operation of all Kup functions. Use as a portable base, in a similar manner to an AC base, or attached to Kup for carrying. Other devices have small built-in batteries which indicate low heat capacity. The battery would not be safe in the same compartment with high heat capability and a small built-in battery will have limited run time. The power and flexibility of Hot Kups battery are proprietary and unique.