GP Lithium AA Batteries 1.5V from their Breaks the Limits range of GP Lithium Batteries. These GP Lithium AA batteries are long lasting 1.5V batteries and manufactured to a very high standard and best for medical and professional devices. Each pack contains 4 batteries, a box contains 10 packs or 40 batteries. These GP Lithium AA batteries have the part number GP15LF-2U4 and are also known as FR6 L91 LF1500. They have an extremely long shelf life of around 9 years.