2 X 357 SR44W EPX76 Compatible Batteries Suitable for: Olympus 2 4 and 10 Cameras These are generally used to power the internal focus guides in the eyepiece as well as other camera information and functions which vary by Camera As pictured, these are new in blister packs, and will be Silver Oxide chemistry which the manufacturers specify and NEVER inferior alkaline batteries to be sure you are getting the best available and safest product. These Silver Oxide batteries are from selected well known Swiss, Japanese or USA brands NOT Chinese, to provide the required voltage stability not found in the cheaper alkaline chemistry on offer from many sellers. As we do not supply or recommend Alkaline LR44 or AG13 for valuable equipment, our prices may seem to be higher, but you will get the.