Mercury batteries are commonly found on cameras and exposure meters produced in the 60s to 80s. The Canon F-1, Minolta SRT-101, Leica M5, and Yashica 124G are famous cameras using mercury cells. Today, most countries have banned the production of mercury cells due to environmental concerns. Thus, a suitable replacement battery is required to bring them back to life. Battery Compatibility Checker Available AnalogBattery.com ANALOG produces drop-in replacement batteries that substitute mercury batteries with no compromise. You can achieve accurate exposure results with this direct replacement; no camera modification is needed. After removing the seal, please wait for 30 minutes before use. It allows the battery to stabilise the output voltage. Each zinc-air cell lasts around 1 to 2 months. Remark: Do not use alkaline or silver-oxide batteries on mercury cell-powered devices. Otherwise, it might damage the device permanently. Please recycle batteries after use. Replaces PX625, PX13, H-D, MR-9, E-625N, EPX625, 625 Mercury and cadmium-free High Capacity Remove the seal before use Made in the UK