Energizer Ultimate Lithium AA batteries are the world's longest lasting single use AA battery for high-tech devices and are bulk packed in trays of 620 loose batteries. These trays are strictly for OEM use. These Energizer Lithium AA batteries will hold their power for up to 25 years. Some of the advantages of Energizer Lithium AA are that they work at low temperature extremes where other types will not, excellent performance even after 25 year storage at ambient conditions and longer service than other primary battery types. Lithium AA batteries are also known as L91 or FR6 size batteries. These 3Ah (3000mAh) batteries are 50.5mm in length and 14.5mm in diameter. Order before 3pm and we will dispatch today (Mon-Fri).