Only the most modern battery technology is used in hähnel Lithium Ion batteries. They are environmentally friendly, feature a very high energy density & have no memory effect. The batteries are much smaller & lighter than any other rechargeable battery with similar capacity. All batteries are produced to the highest quality standards. A built-in microprocessor safeguards the cells by limiting maximum voltage & by protecting against deep discharge, short circuit & overload. Capacity 1400m Ah 7. 2V 10. 8 Wh Litium Ion Replacement for Sony Np-FM55h