They are environmentally friendly, feature a very high energy density and have no memory effect. The batteries are much smaller and 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 and by protecting against deep discharge, short circuit and overload. International deliveries can take 3-12 days depending upon your location. Return posting costs will be at your expense. The item must be in its original condition for a return to be accepted.