Lithium batteries by Energizer® are the best choice for strobe lights and other survival related equipment.  These batteries provide a long, 15 year shelf life with improved cold weather performance (nearly twice the service life of alkaline batteries when used in high drain devices).  Thus ideal for installation in survival related equipment that is stowed and seldom used.  Reliable operation in temperature extremes from -40º C to 140º C.  Sold in packages of four (4) batteries.