Precise energy, perfectly aligned to the different functions of the photo devices</br>Last much longer than ordinary alkaline batteries</br>Low self-discharge rate</br>Designed for use in photographic devices, calculators, memory backup, pocket pagers and more</br>Delivers endurance and reliability in high and low temperature operations</br>Storage life of up to 10 years when stored at room temperature</br></br>Product Description</br></br>Energizer Photo battery # CR2 size, 2 pack</br></br>Amazon.com</br></br>The Energizer 3-volt lithium photoelectronic battery was designed for  use in photographic devices, calculators, memory backup, pocket pagers, watches,  and other demanding equipment. This lithium battery delivers endurance and  reliability in high and low temperature operations and has a storage life of up to  10 years when stored at room temperature.</br><br/>http://www.amazon.com/gp/product/B00004TDSA