Four Halcyon 1200 mAH Lithium Ion Replacement Battery for Olympus Stylus 850 SW 8 MP Digital Camera and Olympus LI-42B Package Includes: 4 Halcyon Brand Battery Battery Specs: 1200 mAh with Premium Japanese Cells Halcyon Support: Includes 5 Year Halcyon Replacement Warranty. Full Membership Access to Halcyon Customer Support Website Frustration Free Packaging. No wasteful and dangerous plastic blister packs. Compatible with all cameras which take Olympus LI-42B Batteries